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7(-21+2y)+2y=-9
We move all terms to the left:
7(-21+2y)+2y-(-9)=0
We add all the numbers together, and all the variables
7(2y-21)+2y-(-9)=0
We add all the numbers together, and all the variables
2y+7(2y-21)+9=0
We multiply parentheses
2y+14y-147+9=0
We add all the numbers together, and all the variables
16y-138=0
We move all terms containing y to the left, all other terms to the right
16y=138
y=138/16
y=8+5/8
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