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4=0.3x-0.4x-5
We move all terms to the left:
4-(0.3x-0.4x-5)=0
We add all the numbers together, and all the variables
-(-0.1x-5)+4=0
We get rid of parentheses
0.1x+5+4=0
We add all the numbers together, and all the variables
0.1x+9=0
We move all terms containing x to the left, all other terms to the right
0.1x=-9
x=-9/0.1
x=-90
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