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2(-1.4+0.6d)+0.4d=-8.4
We move all terms to the left:
2(-1.4+0.6d)+0.4d-(-8.4)=0
We add all the numbers together, and all the variables
2(0.6d-1.4)+0.4d-(-8.4)=0
We add all the numbers together, and all the variables
0.4d+2(0.6d-1.4)+8.4=0
We multiply parentheses
0.4d+0d-2.8+8.4=0
We add all the numbers together, and all the variables
1.4d+5.6=0
We move all terms containing d to the left, all other terms to the right
1.4d=-5.6
d=-5.6/1.4
d=-4
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