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(1/2)*x-((2/5)*x) = 10 // - 10
(1/2)*x-((2/5)*x)-10 = 0
(1/2)*x+(-2/5)*x-10 = 0
1/10*x-10 = 0 // + 10
1/10*x = 10 // : 1/10
x = 10/1/10
x = 100
x = 100
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