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(4/5)*(10*x-5) = 12 // - 12
(4/5)*(10*x-5)-12 = 0
4/5*(10*x-5)-12 = 0
4/5*(10*x-5)-12 = 0
8*x-16 = 0
8*x-16 = 0
8*x-16 = 0 // + 16
8*x = 16 // : 8
x = 16/8
x = 2
x = 2
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