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x in (-oo:+oo)
(3/5)*x+3 = (6/7)*x+87/35 // - (6/7)*x+87/35
(3/5)*x-((6/7)*x)-(87/35)+3 = 0
(3/5)*x+(-6/7)*x-87/35+3 = 0
18/35-9/35*x = 0 // - 18/35
-9/35*x = -18/35 // : -9/35
x = -18/35/(-9/35)
x = 2
x = 2
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