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6(1-x)-2x=-5x+21
We move all terms to the left:
6(1-x)-2x-(-5x+21)=0
We add all the numbers together, and all the variables
6(-1x+1)-2x-(-5x+21)=0
We add all the numbers together, and all the variables
-2x+6(-1x+1)-(-5x+21)=0
We multiply parentheses
-2x-6x-(-5x+21)+6=0
We get rid of parentheses
-2x-6x+5x-21+6=0
We add all the numbers together, and all the variables
-3x-15=0
We move all terms containing x to the left, all other terms to the right
-3x=15
x=15/-3
x=-5
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