4(2x+5)-8=36
Multiply 4 by the contents of the bracket as follows:
4 * 2x + 4*5=8x +20,
So, you have 8x +20 -8=36
Move the +20 and the -8 to the right-hand side and CHANGE the sign from + to - and vice' versa:
Thus: 8x=36 - 20 +8, then we have:
8x=24, Divide both sides by 8 and you get,
x=24/8=3, so
x=3
