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x in (-oo:+oo)
-274/63 = (6/7)*x+(2/3)*x+2/9 // - (6/7)*x+(2/3)*x+2/9
-((6/7)*x)-((2/3)*x)-274/63-(2/9) = 0
(-6/7)*x+(-2/3)*x-274/63-2/9 = 0
-32/21*x-32/7 = 0 // + 32/7
-32/21*x = 32/7 // : -32/21
x = 32/7/(-32/21)
x = -3
x = -3
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