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(.12)(3000+x)=4200
We move all terms to the left:
(.12)(3000+x)-(4200)=0
We add all the numbers together, and all the variables
(0.12)(x+3000)-4200=0
We multiply parentheses ..
(+0.12x+360)-4200=0
We add all the numbers together, and all the variables
(0.12x+360)-4200=0
We get rid of parentheses
0.12x+360-4200=0
We add all the numbers together, and all the variables
0.12x-3840=0
We move all terms containing x to the left, all other terms to the right
0.12x=3840
x=3840/0.12
x=32000
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