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2.1x+58.5=27.0-8.4x
We move all terms to the left:
2.1x+58.5-(27.0-8.4x)=0
We add all the numbers together, and all the variables
2.1x-(-8.4x+27)+58.5=0
We get rid of parentheses
2.1x+8.4x-27+58.5=0
We add all the numbers together, and all the variables
10.5x+31.5=0
We move all terms containing x to the left, all other terms to the right
10.5x=-31.5
x=-31.5/10.5
x=-3
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