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8=0.4x+7.5
We move all terms to the left:
8-(0.4x+7.5)=0
We get rid of parentheses
-0.4x-7.5+8=0
We add all the numbers together, and all the variables
-0.4x+0.5=0
We move all terms containing x to the left, all other terms to the right
-0.4x=-0.5
x=-0.5/-0.4
x=1+0.1/0.4
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