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x in (-oo:+oo)
7*X = 1.5*(7/1.5)*x // - 1.5*(7/1.5)*x
7*X-(1.5*(7/1.5)*x) = 0
7*X-7*x = 0
7*X-7*x = 0 // - 7*X
-7*x = -(7*X) // : -7
x = (-(7*X))/(-7)
x = X
x = X
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