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x in (-oo:+oo)
12*x-(6/5) = -18 // + 18
12*x-(6/5)+18 = 0
12*x-6/5+18 = 0
12*x+84/5 = 0 // - 84/5
12*x = -84/5 // : 12
x = -84/5/12
x = -7/5
x = -7/5
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