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x/2.1+0.3=-5
We move all terms to the left:
x/2.1+0.3-(-5)=0
We add all the numbers together, and all the variables
x/2.1+5.3=0
We multiply all the terms by the denominator
x+(5.3)*2.1=0
We add all the numbers together, and all the variables
x+11.13=0
We move all terms containing x to the left, all other terms to the right
x=-11.13
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