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-5(x+3)+2=-21-3x
We move all terms to the left:
-5(x+3)+2-(-21-3x)=0
We add all the numbers together, and all the variables
-5(x+3)-(-3x-21)+2=0
We multiply parentheses
-5x-(-3x-21)-15+2=0
We get rid of parentheses
-5x+3x+21-15+2=0
We add all the numbers together, and all the variables
-2x+8=0
We move all terms containing x to the left, all other terms to the right
-2x=-8
x=-8/-2
x=+4
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