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(2/5)*(x-15) = 500 // - 500
(2/5)*(x-15)-500 = 0
2/5*(x-15)-500 = 0
2/5*(x-15)-500 = 0
2/5*x-506 = 0
2/5*x-506 = 0
2/5*x-506 = 0 // + 506
2/5*x = 506 // : 2/5
x = 506/2/5
x = 1265
x = 1265
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