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-150-10x=21+9x
We move all terms to the left:
-150-10x-(21+9x)=0
We add all the numbers together, and all the variables
-10x-(9x+21)-150=0
We get rid of parentheses
-10x-9x-21-150=0
We add all the numbers together, and all the variables
-19x-171=0
We move all terms containing x to the left, all other terms to the right
-19x=171
x=171/-19
x=-9
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