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11x+28=21+7x
We move all terms to the left:
11x+28-(21+7x)=0
We add all the numbers together, and all the variables
11x-(7x+21)+28=0
We get rid of parentheses
11x-7x-21+28=0
We add all the numbers together, and all the variables
4x+7=0
We move all terms containing x to the left, all other terms to the right
4x=-7
x=-7/4
x=-1+3/4
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