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-6.57=x/2.1+1.83
We move all terms to the left:
-6.57-(x/2.1+1.83)=0
We get rid of parentheses
-x/2.1-1.83-6.57=0
We multiply all the terms by the denominator
-x-(1.83)*2.1-(6.57)*2.1=0
We add all the numbers together, and all the variables
-1x-17.64=0
We move all terms containing x to the left, all other terms to the right
-x=17.64
x=17.64/-1
x=-17+0.64/1
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