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y in (-oo:+oo)
4-((3*y)/4) = 7 // - 7
4-((3*y)/4)-7 = 0
(-3/4)*y-7+4 = 0
-3/4*y-3 = 0 // + 3
-3/4*y = 3 // : -3/4
y = 3/(-3/4)
y = -4
y = -4
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