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4x+3x+x+18=21+5
We move all terms to the left:
4x+3x+x+18-(21+5)=0
We add all the numbers together, and all the variables
4x+3x+x+18-26=0
We add all the numbers together, and all the variables
8x-8=0
We move all terms containing x to the left, all other terms to the right
8x=8
x=8/8
x=1
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