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x in (-oo:+oo)
4-((1/4)*x) = -3 // + 3
3-((1/4)*x)+4 = 0
(-1/4)*x+3+4 = 0
7-1/4*x = 0 // - 7
-1/4*x = -7 // : -1/4
x = -7/(-1/4)
x = 28
x = 28
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