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y in (-oo:+oo)
y = (3/4)*y+30 // - (3/4)*y+30
y-((3/4)*y)-30 = 0
y+(-3/4)*y-30 = 0
1/4*y-30 = 0 // + 30
1/4*y = 30 // : 1/4
y = 30/1/4
y = 120
y = 120
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