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0.2x-23+0.2x-43=90
We move all terms to the left:
0.2x-23+0.2x-43-(90)=0
We add all the numbers together, and all the variables
0.4x-156=0
We move all terms containing x to the left, all other terms to the right
0.4x=156
x=156/0.4
x=390
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