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0.04x+5x+15=21
We move all terms to the left:
0.04x+5x+15-(21)=0
We add all the numbers together, and all the variables
5.04x-6=0
We move all terms containing x to the left, all other terms to the right
5.04x=6
x=6/5.04
x=1+0.96/5.04
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