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(2/5)*(x-15) = 7 // - 7
(2/5)*(x-15)-7 = 0
2/5*(x-15)-7 = 0
2/5*(x-15)-7 = 0
2/5*x-13 = 0
2/5*x-13 = 0
2/5*x-13 = 0 // + 13
2/5*x = 13 // : 2/5
x = 13/2/5
x = 65/2
x = 65/2
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