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(2*x)/5-(x/6) = -7/10 // + -7/10
(2*x)/5-(x/6)-(-7/10) = 0
(2*x)/5-(x/6)+7/10 = 0
7/30*x+7/10 = 0 // - 7/10
7/30*x = -7/10 // : 7/30
x = -7/10/7/30
x = -3
x = -3
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