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(600-3x)=30
We move all terms to the left:
(600-3x)-(30)=0
We add all the numbers together, and all the variables
(-3x+600)-30=0
We get rid of parentheses
-3x+600-30=0
We add all the numbers together, and all the variables
-3x+570=0
We move all terms containing x to the left, all other terms to the right
-3x=-570
x=-570/-3
x=+190
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