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