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3*((4*x)/5-1) = x // - x
3*((4*x)/5-1)-x = 0
3*(4/5*x-1)-x = 0
3*(4/5*x-1)-x = 0
7/5*x-3 = 0
7/5*x-3 = 0
7/5*x-3 = 0 // + 3
7/5*x = 3 // : 7/5
x = 3/7/5
x = 15/7
x = 15/7
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