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x in (-oo:+oo)
2*x+6 = -6*x-26 // + -6*x-26
2*x-(-6*x)+6+26 = 0
2*x+6*x+6+26 = 0
8*x+32 = 0 // - 32
8*x = -32 // : 8
x = -32/8
x = -4
x = -4
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