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21x+1850+4500=30x+2250
We move all terms to the left:
21x+1850+4500-(30x+2250)=0
We add all the numbers together, and all the variables
21x-(30x+2250)+6350=0
We get rid of parentheses
21x-30x-2250+6350=0
We add all the numbers together, and all the variables
-9x+4100=0
We move all terms containing x to the left, all other terms to the right
-9x=-4100
x=-4100/-9
x=455+5/9
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