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(2/5)*(10*x-25) = 4 // - 4
(2/5)*(10*x-25)-4 = 0
2/5*(10*x-25)-4 = 0
2/5*(10*x-25)-4 = 0
4*x-14 = 0
4*x-14 = 0
4*x-14 = 0 // + 14
4*x = 14 // : 4
x = 14/4
x = 7/2
x = 7/2
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