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0.02+0.10(100-x)=0.42x
We move all terms to the left:
0.02+0.10(100-x)-(0.42x)=0
We add all the numbers together, and all the variables
0.10(-1x+100)-(+0.42x)+0.02=0
We multiply parentheses
-0.1x-(+0.42x)+10+0.02=0
We get rid of parentheses
-0.1x-0.42x+10+0.02=0
We add all the numbers together, and all the variables
-0.52x+10.02=0
We move all terms containing x to the left, all other terms to the right
-0.52x=-10.02
x=-10.02/-0.52
x=19+0.14/0.52
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