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16.8-0.5x=12.8-0.7x
We move all terms to the left:
16.8-0.5x-(12.8-0.7x)=0
We add all the numbers together, and all the variables
-0.5x-(-0.7x+12.8)+16.8=0
We get rid of parentheses
-0.5x+0.7x-12.8+16.8=0
We add all the numbers together, and all the variables
0.2x+4=0
We move all terms containing x to the left, all other terms to the right
0.2x=-4
x=-4/0.2
x=-20
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