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(3/5)*x-((1/10)*x) = 12 // - 12
(3/5)*x-((1/10)*x)-12 = 0
(3/5)*x+(-1/10)*x-12 = 0
1/2*x-12 = 0 // + 12
1/2*x = 12 // : 1/2
x = 12/1/2
x = 24
x = 24
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