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x in (-oo:+oo)
7*(6*x+5) = 77 // - 77
7*(6*x+5)-77 = 0
7*(6*x+5)-77 = 0
42*x-42 = 0
42*x-42 = 0
42*x-42 = 0 // + 42
42*x = 42 // : 42
x = 42/42
x = 1
x = 1
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