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x in (-oo:+oo)
7*(1*x+1) = 49 // - 49
7*(1*x+1)-49 = 0
7*(x+1)-49 = 0
7*(x+1)-49 = 0
7*x-42 = 0
7*x-42 = 0
7*x-42 = 0 // + 42
7*x = 42 // : 7
x = 42/7
x = 6
x = 6
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