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4x+12=7x+3=180
We move all terms to the left:
4x+12-(7x+3)=0
We get rid of parentheses
4x-7x-3+12=0
We add all the numbers together, and all the variables
-3x+9=0
We move all terms containing x to the left, all other terms to the right
-3x=-9
x=-9/-3
x=+3
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