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(3/10)*x-4 = (1/5)*x // - (1/5)*x
(3/10)*x-((1/5)*x)-4 = 0
(3/10)*x+(-1/5)*x-4 = 0
1/10*x-4 = 0 // + 4
1/10*x = 4 // : 1/10
x = 4/1/10
x = 40
x = 40
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