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x in (-oo:+oo)
6*(7*x+2) = 222 // - 222
6*(7*x+2)-222 = 0
6*(7*x+2)-222 = 0
42*x-210 = 0
42*x-210 = 0
42*x-210 = 0 // + 210
42*x = 210 // : 42
x = 210/42
x = 5
x = 5
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