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0.7x+90=180
We move all terms to the left:
0.7x+90-(180)=0
We add all the numbers together, and all the variables
0.7x-90=0
We move all terms containing x to the left, all other terms to the right
0.7x=90
x=90/0.7
x=128+0.40000000000001/0.7
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