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y in (-oo:+oo)
(3/4)*y-30 = -16.5 // + 16.5
(3/4)*y-30+16.5 = 0
3/4*y-13.5 = 0 // + 13.5
3/4*y = 13.5 // : 3/4
y = 13.5/3/4
y = 18
y = 18
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