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y in (-oo:+oo)
8 = (4/9)*y-7 // - (4/9)*y-7
7-((4/9)*y)+8 = 0
(-4/9)*y+7+8 = 0
15-4/9*y = 0 // - 15
-4/9*y = -15 // : -4/9
y = -15/(-4/9)
y = 135/4
y = 135/4
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