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26x+21-4x=4x-21
We move all terms to the left:
26x+21-4x-(4x-21)=0
We add all the numbers together, and all the variables
22x-(4x-21)+21=0
We get rid of parentheses
22x-4x+21+21=0
We add all the numbers together, and all the variables
18x+42=0
We move all terms containing x to the left, all other terms to the right
18x=-42
x=-42/18
x=-2+1/3
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