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x in (-oo:+oo)
6*x-(18/4) = 7*x // - 7*x
6*x-(7*x)-(18/4) = 0
6*x-7*x-9/2 = 0
-x-9/2 = 0 // + 9/2
-x = 9/2 // * -1
x = -9/2
x = -9/2
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