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x in (-oo:+oo)
x/12-7 = 5*x // - 5*x
x/12-(5*x)-7 = 0
x/12-5*x-7 = 0
-59/12*x-7 = 0 // + 7
-59/12*x = 7 // : -59/12
x = 7/(-59/12)
x = -84/59
x = -84/59
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