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