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x in (-oo:+oo)
1-7*x = -(3*x)-43 // + -(3*x)-43
3*x-7*x+1+43 = 0
44-4*x = 0 // - 44
-4*x = -44 // : -4
x = -44/(-4)
x = 11
x = 11
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