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x in (-oo:+oo)
0 = (-4/7)*x+(1/2)*x+1/2 // - (-4/7)*x+(1/2)*x+1/2
0-((-4/7)*x)-((1/2)*x)-(1/2) = 0
(4/7)*x+(-1/2)*x-1/2 = 0
1/14*x-1/2 = 0 // + 1/2
1/14*x = 1/2 // : 1/14
x = 1/2/1/14
x = 7
x = 7
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