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4x+2x+3+3x-9=180
We move all terms to the left:
4x+2x+3+3x-9-(180)=0
We add all the numbers together, and all the variables
9x-186=0
We move all terms containing x to the left, all other terms to the right
9x=186
x=186/9
x=20+2/3
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