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x in (-oo:+oo)
3*(x-5) = 36/12 // - 36/12
3*(x-5)-(36/12) = 0
3*(x-5)-3 = 0
3*(x-5)-3 = 0
3*x-18 = 0
3*x-18 = 0
3*x-18 = 0 // + 18
3*x = 18 // : 3
x = 18/3
x = 6
x = 6
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