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y in (-oo:+oo)
(1/3)*y-7 = (1/10)*y // - (1/10)*y
(1/3)*y-((1/10)*y)-7 = 0
(1/3)*y+(-1/10)*y-7 = 0
7/30*y-7 = 0 // + 7
7/30*y = 7 // : 7/30
y = 7/7/30
y = 30
y = 30
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