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(3/10)*x-2 = (1/5)*x // - (1/5)*x
(3/10)*x-((1/5)*x)-2 = 0
(3/10)*x+(-1/5)*x-2 = 0
1/10*x-2 = 0 // + 2
1/10*x = 2 // : 1/10
x = 2/1/10
x = 20
x = 20
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