Oh, dude, that's like basic math. So, if you have x minus 7 equals 8, you just add 7 to both sides to get x equals 15. Easy peasy lemon squeezy. Math, man, it's like magic but with numbers.
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x - 7 = 8
x = 7 + 8
x = 15
X/8-4=7 X/8=11 X=11 x 8 X=88 ;-)
Because of the minus sign, 8 turns to -8, -8x3=-24.
7+x=15 x=8
(2x - 7)(x + 1)
[ x3 - 4x2 + 7x ] / (x) = x2 - 4x + 7