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x in (-oo:+oo)
4*x+2 = -3*x-40 // + -3*x-40
4*x-(-3*x)+2+40 = 0
4*x+3*x+2+40 = 0
7*x+42 = 0 // - 42
7*x = -42 // : 7
x = -42/7
x = -6
x = -6
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