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-4.2+0.02x-0.4=0.03
We move all terms to the left:
-4.2+0.02x-0.4-(0.03)=0
We add all the numbers together, and all the variables
0.02x-4.63=0
We move all terms containing x to the left, all other terms to the right
0.02x=4.63
x=4.63/0.02
x=231+0.0099999999999998/0.02
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