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3*x+(1/2)*x-((2/5)*x) = x/10+7/20 // - x/10+7/20
3*x+(1/2)*x-((2/5)*x)-(x/10)-(7/20) = 0
3*x+(1/2)*x+(-2/5)*x-(x/10)-7/20 = 0
3*x-7/20 = 0 // + 7/20
3*x = 7/20 // : 3
x = 7/20/3
x = 7/60
x = 7/60
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