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x in (-oo:+oo)
3/4-6*x = -21/4 // + -21/4
3/4-6*x-(-21/4) = 0
3/4-6*x+21/4 = 0
6-6*x = 0 // - 6
-6*x = -6 // : -6
x = -6/(-6)
x = 1
x = 1
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