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x=(4200*1*100-1000)/(4200*1)
We move all terms to the left:
x-((4200*1*100-1000)/(4200*1))=0
We add all the numbers together, and all the variables
x-(419000/4200)=0
We get rid of parentheses
x-419000/4200=0
We multiply all the terms by the denominator
x*4200-419000=0
Wy multiply elements
4200x-419000=0
We move all terms containing x to the left, all other terms to the right
4200x=419000
x=419000/4200
x=99+16/21
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