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x in (-oo:+oo)
5*(7*x+6) = 100 // - 100
5*(7*x+6)-100 = 0
5*(7*x+6)-100 = 0
35*x-70 = 0
35*x-70 = 0
35*x-70 = 0 // + 70
35*x = 70 // : 35
x = 70/35
x = 2
x = 2
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