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2.1x+-5=7.7
We move all terms to the left:
2.1x+-5-(7.7)=0
We add all the numbers together, and all the variables
2.1x-12.7=0
We move all terms containing x to the left, all other terms to the right
2.1x=12.7
x=12.7/2.1
x=6+0.1/2.1
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