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y in (-oo:+oo)
28-((3/10)*y) = (7/10)*y-12 // - (7/10)*y-12
12-((3/10)*y)-((7/10)*y)+28 = 0
(-3/10)*y+(-7/10)*y+12+28 = 0
40-y = 0 // - 40
-y = -40 // * -1
y = 40
y = 40
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