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4(5x+7)=-21+9
We move all terms to the left:
4(5x+7)-(-21+9)=0
We add all the numbers together, and all the variables
4(5x+7)-(-12)=0
We add all the numbers together, and all the variables
4(5x+7)+12=0
We multiply parentheses
20x+28+12=0
We add all the numbers together, and all the variables
20x+40=0
We move all terms containing x to the left, all other terms to the right
20x=-40
x=-40/20
x=-2
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