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2.5+d=4-1.3d
We move all terms to the left:
2.5+d-(4-1.3d)=0
We add all the numbers together, and all the variables
d-(-1.3d+4)+2.5=0
We get rid of parentheses
d+1.3d-4+2.5=0
We add all the numbers together, and all the variables
2.3d-1.5=0
We move all terms containing d to the left, all other terms to the right
2.3d=1.5
d=1.5/2.3
d=1/1.5333333333333
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