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19=3(y-7)-7y
We move all terms to the left:
19-(3(y-7)-7y)=0
We calculate terms in parentheses: -(3(y-7)-7y), so:We get rid of parentheses
3(y-7)-7y
We add all the numbers together, and all the variables
-7y+3(y-7)
We multiply parentheses
-7y+3y-21
We add all the numbers together, and all the variables
-4y-21
Back to the equation:
-(-4y-21)
4y+21+19=0
We add all the numbers together, and all the variables
4y+40=0
We move all terms containing y to the left, all other terms to the right
4y=-40
y=-40/4
y=-10
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