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577.77=210+1.23x
We move all terms to the left:
577.77-(210+1.23x)=0
We add all the numbers together, and all the variables
-(1.23x+210)+577.77=0
We get rid of parentheses
-1.23x-210+577.77=0
We add all the numbers together, and all the variables
-1.23x+367.77=0
We move all terms containing x to the left, all other terms to the right
-1.23x=-367.77
x=-367.77/-1.23
x=+299
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