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x in (-oo:+oo)
1/2-((1/5)*x) = (3/7)*x+79/70 // - (3/7)*x+79/70
1/2-((1/5)*x)-((3/7)*x)-(79/70) = 0
(-1/5)*x+(-3/7)*x+1/2-79/70 = 0
-22/35*x-22/35 = 0 // + 22/35
-22/35*x = 22/35 // : -22/35
x = 22/35/(-22/35)
x = -1
x = -1
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