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6x+1x=21+15*3x
We move all terms to the left:
6x+1x-(21+15*3x)=0
We add all the numbers together, and all the variables
6x+1x-(15*3x+21)=0
We add all the numbers together, and all the variables
7x-(15*3x+21)=0
We get rid of parentheses
7x-15*3x-21=0
Wy multiply elements
7x-45x-21=0
We add all the numbers together, and all the variables
-38x-21=0
We move all terms containing x to the left, all other terms to the right
-38x=21
x=21/-38
x=-21/38
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