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(1/5)*(25*x-75)+9 = (1/4)*(8*x+36) // - (1/4)*(8*x+36)
(1/5)*(25*x-75)-((1/4)*(8*x+36))+9 = 0
(1/5)*(25*x-75)+(-1/4)*(8*x+36)+9 = 0
1/5*(25*x-75)-1/4*(8*x+36)+9 = 0
1/5*(25*x-75)-1/4*(8*x+36)+9 = 0
3*x-24+9 = 0
3*x-15 = 0
3*x-15 = 0
3*x-15 = 0 // + 15
3*x = 15 // : 3
x = 15/3
x = 5
x = 5
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