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x in (-oo:+oo)
5*x+7 = 127-5*x // - 127-5*x
5*x-(-5*x)-127+7 = 0
5*x+5*x-127+7 = 0
10*x-120 = 0 // + 120
10*x = 120 // : 10
x = 120/10
x = 12
x = 12
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