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10 = (1/3)*(x-15) // - (1/3)*(x-15)
10-((1/3)*(x-15)) = 0
(-1/3)*(x-15)+10 = 0
10-1/3*(x-15) = 0
10-1/3*(x-15) = 0
15-1/3*x = 0
15-1/3*x = 0
15-1/3*x = 0 // - 15
-1/3*x = -15 // : -1/3
x = -15/(-1/3)
x = 45
x = 45
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