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x in (-oo:+oo)
(-1/4)*x-(3/4) = -20 // + 20
(-1/4)*x-(3/4)+20 = 0
(-1/4)*x-3/4+20 = 0
77/4-1/4*x = 0 // - 77/4
-1/4*x = -77/4 // : -1/4
x = -77/4/(-1/4)
x = 77
x = 77
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