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3+5.2x=-13-2.8x
We move all terms to the left:
3+5.2x-(-13-2.8x)=0
We add all the numbers together, and all the variables
5.2x-(-2.8x-13)+3=0
We get rid of parentheses
5.2x+2.8x+13+3=0
We add all the numbers together, and all the variables
8x+16=0
We move all terms containing x to the left, all other terms to the right
8x=-16
x=-16/8
x=-2
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