Melody:
5(a+4)=6-(a-9)
Hi Anonymous 4334,
If this was a question that someone was asking me I would put in a real lot of steps to make it easier to follow.
However, if I was doing it for myself this is what I would do.
5(a+4)=6-(a-9)
5a+20 =6-a+9
5a+20 = 15-a
6a+20=15
6a=-5
a=-5/6
Maybe I should check that you understand, the minus sign always belongs to the thing behind it. And, if there is nothing between a minus sign and a bracket, there is really an invisible one.
so I will do the RHS (right hand side) really slowly.
6-(a-9)
= 6 - 1(a-9)
= 6+ -1(a-9)
= 6+ (-1*a) +(-1*-9)
= 6+-a++9
= 6-a+9
= 6+9-a
= 15-a
And, on paper I would line up all the equal signs (underneath each other)
Do you understand all that.
Don't do the next one unless you completly understand the first one.
Do you want to try another one?
1-5(x+3)= -(x+17) - 2(6-x)