Solve for y
y=6
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7.5=4+y-2.5
Subtract 1 from 5 to get 4.
7.5=1.5+y
Subtract 2.5 from 4 to get 1.5.
1.5+y=7.5
Swap sides so that all variable terms are on the left hand side.
y=7.5-1.5
Subtract 1.5 from both sides.
y=6
Subtract 1.5 from 7.5 to get 6.
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