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-21=-10x-5
We move all terms to the left:
-21-(-10x-5)=0
We get rid of parentheses
10x+5-21=0
We add all the numbers together, and all the variables
10x-16=0
We move all terms containing x to the left, all other terms to the right
10x=16
x=16/10
x=1+3/5
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