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(1/2)*x-((2/5)*x) = 6 // - 6
(1/2)*x-((2/5)*x)-6 = 0
(1/2)*x+(-2/5)*x-6 = 0
1/10*x-6 = 0 // + 6
1/10*x = 6 // : 1/10
x = 6/1/10
x = 60
x = 60
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