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1/2(8+12)+y=-18
We move all terms to the left:
1/2(8+12)+y-(-18)=0
We add all the numbers together, and all the variables
y+1/220-(-18)=0
We add all the numbers together, and all the variables
y+18+1/220=0
We multiply all the terms by the denominator
y*220+1+18*220=0
We add all the numbers together, and all the variables
y*220+3961=0
Wy multiply elements
220y+3961=0
We move all terms containing y to the left, all other terms to the right
220y=-3961
y=-3961/220
y=-18+1/220
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