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-3*7-0.5y+4y=-10
We move all terms to the left:
-3*7-0.5y+4y-(-10)=0
We add all the numbers together, and all the variables
3.5y-11=0
We move all terms containing y to the left, all other terms to the right
3.5y=11
y=11/3.5
y=3+0.5/3.5
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