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x in (-oo:+oo)
(-1/4)*x = -2.5 // + 2.5
(-1/4)*x+2.5 = 0
2.5-1/4*x = 0 // - 2.5
-1/4*x = -2.5 // : -1/4
x = -2.5/(-1/4)
x = 10
x = 10
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