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(5*x)/7 = -10/4 // + -10/4
(5*x)/7-(-10/4) = 0
(5*x)/7+5/2 = 0
5/7*x+5/2 = 0 // - 5/2
5/7*x = -5/2 // : 5/7
x = -5/2/5/7
x = -7/2
x = -7/2
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