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y in (-oo:+oo)
2*y = -40/7 // + -40/7
2*y-(-40/7) = 0
2*y+40/7 = 0
2*y+40/7 = 0 // - 40/7
2*y = -40/7 // : 2
y = -40/7/2
y = -20/7
y = -20/7
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