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4x+30=21+10x
We move all terms to the left:
4x+30-(21+10x)=0
We add all the numbers together, and all the variables
4x-(10x+21)+30=0
We get rid of parentheses
4x-10x-21+30=0
We add all the numbers together, and all the variables
-6x+9=0
We move all terms containing x to the left, all other terms to the right
-6x=-9
x=-9/-6
x=1+1/2
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