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y in (-oo:+oo)
(2/3)*y+7 = (5/4)*y // - (5/4)*y
(2/3)*y-((5/4)*y)+7 = 0
(2/3)*y+(-5/4)*y+7 = 0
7-7/12*y = 0 // - 7
-7/12*y = -7 // : -7/12
y = -7/(-7/12)
y = 12
y = 12
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