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x in (-oo:+oo)
(5/7)*x+3/8 = (-1/2)*x+89/56 // - (-1/2)*x+89/56
(5/7)*x-((-1/2)*x)+3/8-(89/56) = 0
(5/7)*x+(1/2)*x+3/8-89/56 = 0
17/14*x-17/14 = 0 // + 17/14
17/14*x = 17/14 // : 17/14
x = 17/14/17/14
x = 1
x = 1
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