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y in (-oo:+oo)
3*y-((2*21)/5) = 4 // - 4
3*y-((2*21)/5)-4 = 0
3*y-42/5-4 = 0
3*y-62/5 = 0 // + 62/5
3*y = 62/5 // : 3
y = 62/5/3
y = 62/15
y = 62/15
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