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15 = (3/8)*(x-5) // - (3/8)*(x-5)
15-((3/8)*(x-5)) = 0
(-3/8)*(x-5)+15 = 0
15-3/8*(x-5) = 0
15-3/8*(x-5) = 0
135/8-3/8*x = 0
135/8-3/8*x = 0
135/8-3/8*x = 0 // - 135/8
-3/8*x = -135/8 // : -3/8
x = -135/8/(-3/8)
x = 45
x = 45
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