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3*x-((2/5)*x) = x/10-(7/4) // - x/10-(7/4)
3*x-((2/5)*x)-(x/10)+7/4 = 0
3*x+(-2/5)*x-(x/10)+7/4 = 0
5/2*x+7/4 = 0 // - 7/4
5/2*x = -7/4 // : 5/2
x = -7/4/5/2
x = -7/10
x = -7/10
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