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6x-x+4-2.1=-3
We move all terms to the left:
6x-x+4-2.1-(-3)=0
We add all the numbers together, and all the variables
5x+4.9=0
We move all terms containing x to the left, all other terms to the right
5x=-4.9
x=-4.9/5
x=-2.57894736842/2.63157894737
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