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(1/5)*x-((1/10)*x) = 7/2 // - 7/2
(1/5)*x-((1/10)*x)-(7/2) = 0
(1/5)*x+(-1/10)*x-7/2 = 0
1/10*x-7/2 = 0 // + 7/2
1/10*x = 7/2 // : 1/10
x = 7/2/1/10
x = 35
x = 35
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