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(45-3x)=180
We move all terms to the left:
(45-3x)-(180)=0
We add all the numbers together, and all the variables
(-3x+45)-180=0
We get rid of parentheses
-3x+45-180=0
We add all the numbers together, and all the variables
-3x-135=0
We move all terms containing x to the left, all other terms to the right
-3x=135
x=135/-3
x=-45
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