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x in (-oo:+oo)
4*x+9 = 79-3*x // - 79-3*x
4*x-(-3*x)-79+9 = 0
4*x+3*x-79+9 = 0
7*x-70 = 0 // + 70
7*x = 70 // : 7
x = 70/7
x = 10
x = 10
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