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y in (-oo:+oo)
1.8-((3/8)*y) = (9/10)*y-6 // - (9/10)*y-6
1.8-((3/8)*y)-((9/10)*y)+6 = 0
(-3/8)*y+(-9/10)*y+1.8+6 = 0
7.8-51/40*y = 0 // - 7.8
-51/40*y = -7.8 // : -51/40
y = -7.8/(-51/40)
y = 6.11764706
y = 6.11764706
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