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x+6x=21+25+3x
We move all terms to the left:
x+6x-(21+25+3x)=0
We add all the numbers together, and all the variables
x+6x-(3x+46)=0
We add all the numbers together, and all the variables
7x-(3x+46)=0
We get rid of parentheses
7x-3x-46=0
We add all the numbers together, and all the variables
4x-46=0
We move all terms containing x to the left, all other terms to the right
4x=46
x=46/4
x=11+1/2
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