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x+21+4x=46-4x-50
We move all terms to the left:
x+21+4x-(46-4x-50)=0
We add all the numbers together, and all the variables
x+4x-(-4x-4)+21=0
We add all the numbers together, and all the variables
5x-(-4x-4)+21=0
We get rid of parentheses
5x+4x+4+21=0
We add all the numbers together, and all the variables
9x+25=0
We move all terms containing x to the left, all other terms to the right
9x=-25
x=-25/9
x=-2+7/9
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