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x in (-oo:+oo)
3*x+4 = 24-7*x // - 24-7*x
3*x-(-7*x)-24+4 = 0
3*x+7*x-24+4 = 0
10*x-20 = 0 // + 20
10*x = 20 // : 10
x = 20/10
x = 2
x = 2
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