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x in (-oo:+oo)
5*x+3 = 69-6*x // - 69-6*x
5*x-(-6*x)-69+3 = 0
5*x+6*x-69+3 = 0
11*x-66 = 0 // + 66
11*x = 66 // : 11
x = 66/11
x = 6
x = 6
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