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x in (-oo:+oo)
(-3/7)*x+3 = (1/2)*x-5 // - (1/2)*x-5
(-3/7)*x-((1/2)*x)+3+5 = 0
(-3/7)*x+(-1/2)*x+3+5 = 0
8-13/14*x = 0 // - 8
-13/14*x = -8 // : -13/14
x = -8/(-13/14)
x = 112/13
x = 112/13
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