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(13-(5*x))/8 = -4 // + 4
(13-(5*x))/8+4 = 0
(13-5*x)/8+4 = 0
(13-5*x)/8+(4*8)/8 = 0
4*8-5*x+13 = 0
45-5*x = 0
(45-5*x)/8 = 0
(45-5*x)/8 = 0 // * 8
45-5*x = 0
45-5*x = 0 // - 45
-5*x = -45 // : -5
x = -45/(-5)
x = 9
x = 9
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