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x in (-oo:+oo)
3*x+7 = -4*x-70 // + -4*x-70
3*x-(-4*x)+7+70 = 0
3*x+4*x+7+70 = 0
7*x+77 = 0 // - 77
7*x = -77 // : 7
x = -77/7
x = -11
x = -11
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