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(2*x)/5+7/10 = -1/2 // + -1/2
(2*x)/5+7/10-(-1/2) = 0
(2*x)/5+7/10+1/2 = 0
2/5*x+6/5 = 0 // - 6/5
2/5*x = -6/5 // : 2/5
x = -6/5/2/5
x = -3
x = -3
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