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(5*x)/7 = -10/14 // + -10/14
(5*x)/7-(-10/14) = 0
(5*x)/7+5/7 = 0
5/7*x+5/7 = 0 // - 5/7
5/7*x = -5/7 // : 5/7
x = -5/7/5/7
x = -1
x = -1
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