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3x+5.10x+7=180
We move all terms to the left:
3x+5.10x+7-(180)=0
We add all the numbers together, and all the variables
8.1x-173=0
We move all terms containing x to the left, all other terms to the right
8.1x=173
x=173/8.1
x=21+1/2.7931034482759
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