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2x*20+x*10=930
We move all terms to the left:
2x*20+x*10-(930)=0
Wy multiply elements
40x+10x-930=0
We add all the numbers together, and all the variables
50x-930=0
We move all terms containing x to the left, all other terms to the right
50x=930
x=930/50
x=18+3/5
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