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10x+20x=33x+66
We move all terms to the left:
10x+20x-(33x+66)=0
We add all the numbers together, and all the variables
30x-(33x+66)=0
We get rid of parentheses
30x-33x-66=0
We add all the numbers together, and all the variables
-3x-66=0
We move all terms containing x to the left, all other terms to the right
-3x=66
x=66/-3
x=-22
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