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2x+5(57-4x)=123
We move all terms to the left:
2x+5(57-4x)-(123)=0
We add all the numbers together, and all the variables
2x+5(-4x+57)-123=0
We multiply parentheses
2x-20x+285-123=0
We add all the numbers together, and all the variables
-18x+162=0
We move all terms containing x to the left, all other terms to the right
-18x=-162
x=-162/-18
x=+9
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