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6x+10*2x=42
We move all terms to the left:
6x+10*2x-(42)=0
Wy multiply elements
6x+20x-42=0
We add all the numbers together, and all the variables
26x-42=0
We move all terms containing x to the left, all other terms to the right
26x=42
x=42/26
x=1+8/13
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