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x in (-oo:+oo)
(-5/7)*x = -15/28 // + -15/28
(-5/7)*x-(-15/28) = 0
(-5/7)*x+15/28 = 0
15/28-5/7*x = 0 // - 15/28
-5/7*x = -15/28 // : -5/7
x = -15/28/(-5/7)
x = 3/4
x = 3/4
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