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3.9x+625=15.21+21x
We move all terms to the left:
3.9x+625-(15.21+21x)=0
We add all the numbers together, and all the variables
3.9x-(21x+15.21)+625=0
We get rid of parentheses
3.9x-21x-15.21+625=0
We add all the numbers together, and all the variables
-17.1x+609.79=0
We move all terms containing x to the left, all other terms to the right
-17.1x=-609.79
x=-609.79/-17.1
x=35+8.7519379844963/13.255813953489
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