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8.3=4x+8.7
We move all terms to the left:
8.3-(4x+8.7)=0
We get rid of parentheses
-4x-8.7+8.3=0
We add all the numbers together, and all the variables
-4x-0.4=0
We move all terms containing x to the left, all other terms to the right
-4x=0.4
x=0.4/-4
x=-0.4/4
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