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(3*x)/4+2/5 = -7/10 // + -7/10
(3*x)/4+2/5-(-7/10) = 0
(3*x)/4+2/5+7/10 = 0
3/4*x+11/10 = 0 // - 11/10
3/4*x = -11/10 // : 3/4
x = -11/10/3/4
x = -22/15
x = -22/15
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