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x in (-oo:+oo)
1-7*x = -4*x-26 // + -4*x-26
1-7*x-(-4*x)+26 = 0
4*x-7*x+1+26 = 0
27-3*x = 0 // - 27
-3*x = -27 // : -3
x = -27/(-3)
x = 9
x = 9
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