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2x+3(1-3x)=45
We move all terms to the left:
2x+3(1-3x)-(45)=0
We add all the numbers together, and all the variables
2x+3(-3x+1)-45=0
We multiply parentheses
2x-9x+3-45=0
We add all the numbers together, and all the variables
-7x-42=0
We move all terms containing x to the left, all other terms to the right
-7x=42
x=42/-7
x=-6
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