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7x-30=21-5x
We move all terms to the left:
7x-30-(21-5x)=0
We add all the numbers together, and all the variables
7x-(-5x+21)-30=0
We get rid of parentheses
7x+5x-21-30=0
We add all the numbers together, and all the variables
12x-51=0
We move all terms containing x to the left, all other terms to the right
12x=51
x=51/12
x=4+1/4
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