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0.4+x/2.8=-2.6
We move all terms to the left:
0.4+x/2.8-(-2.6)=0
We add all the numbers together, and all the variables
x/2.8+3=0
We multiply all the terms by the denominator
x+3*2.8=0
We add all the numbers together, and all the variables
x+8.4=0
We move all terms containing x to the left, all other terms to the right
x=-8.4
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