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3(-x/5)+2x=-21
We move all terms to the left:
3(-x/5)+2x-(-21)=0
We add all the numbers together, and all the variables
2x+3(-x/5)+21=0
We multiply parentheses
2x-3x+21=0
We add all the numbers together, and all the variables
-1x+21=0
We move all terms containing x to the left, all other terms to the right
-x=-21
x=-21/-1
x=+21
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