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(3/8)*(x-7) = 3*x+5 // - 3*x+5
(3/8)*(x-7)-(3*x)-5 = 0
(3/8)*(x-7)-3*x-5 = 0
3/8*(x-7)-3*x-5 = 0
3/8*(x-7)-3*x-5 = 0
-21/8*x-5-21/8 = 0
-21/8*x-61/8 = 0
-21/8*x-61/8 = 0
-21/8*x-61/8 = 0 // + 61/8
-21/8*x = 61/8 // : -21/8
x = 61/8/(-21/8)
x = -61/21
x = -61/21
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