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x in (-oo:+oo)
337/28 = (5/7)*x+6*x+7 // - (5/7)*x+6*x+7
337/28-((5/7)*x)-(6*x)-7 = 0
(-5/7)*x-6*x+337/28-7 = 0
141/28-47/7*x = 0 // - 141/28
-47/7*x = -141/28 // : -47/7
x = -141/28/(-47/7)
x = 3/4
x = 3/4
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