If you type in the problem to the calculator, you will get the answer.
In any case,
"1"x-7.65x=100
First, you combine like terms.
$${\mathtt{1}}{\mathtt{\,-\,}}{\mathtt{7.65}} = {\mathtt{\,-\,}}{\frac{{\mathtt{133}}}{{\mathtt{20}}}} = -{\mathtt{6.65}}$$
Now the equation is as follows:
-6.65x=100
Divide by -6.65 on both sides:
$${\mathtt{\,-\,}}{\frac{{\mathtt{6.65}}{\mathtt{\,\times\,}}{\mathtt{x}}}{-{\mathtt{6.65}}}} = {\frac{{\mathtt{100}}}{-{\mathtt{6.65}}}} \Rightarrow {\mathtt{x}} = {\mathtt{\,-\,}}{\frac{{\mathtt{2\,000}}}{{\mathtt{133}}}} \Rightarrow {\mathtt{x}} = -{\mathtt{15.037\: \!593\: \!984\: \!962\: \!406}}$$
And your answer rounded to the fourth decimal place is 15.0376
If you type in the problem to the calculator, you will get the answer.
In any case,
"1"x-7.65x=100
First, you combine like terms.
$${\mathtt{1}}{\mathtt{\,-\,}}{\mathtt{7.65}} = {\mathtt{\,-\,}}{\frac{{\mathtt{133}}}{{\mathtt{20}}}} = -{\mathtt{6.65}}$$
Now the equation is as follows:
-6.65x=100
Divide by -6.65 on both sides:
$${\mathtt{\,-\,}}{\frac{{\mathtt{6.65}}{\mathtt{\,\times\,}}{\mathtt{x}}}{-{\mathtt{6.65}}}} = {\frac{{\mathtt{100}}}{-{\mathtt{6.65}}}} \Rightarrow {\mathtt{x}} = {\mathtt{\,-\,}}{\frac{{\mathtt{2\,000}}}{{\mathtt{133}}}} \Rightarrow {\mathtt{x}} = -{\mathtt{15.037\: \!593\: \!984\: \!962\: \!406}}$$
And your answer rounded to the fourth decimal place is 15.0376