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4=0.7x-0.8x-6
We move all terms to the left:
4-(0.7x-0.8x-6)=0
We add all the numbers together, and all the variables
-(-0.1x-6)+4=0
We get rid of parentheses
0.1x+6+4=0
We add all the numbers together, and all the variables
0.1x+10=0
We move all terms containing x to the left, all other terms to the right
0.1x=-10
x=-10/0.1
x=-100
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