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6(x+2x)+3x=21
We move all terms to the left:
6(x+2x)+3x-(21)=0
We add all the numbers together, and all the variables
6(+3x)+3x-21=0
We add all the numbers together, and all the variables
3x+6(+3x)-21=0
We multiply parentheses
3x+18x-21=0
We add all the numbers together, and all the variables
21x-21=0
We move all terms containing x to the left, all other terms to the right
21x=21
x=21/21
x=1
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