9x+3+9x+3=21x-3

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Solution for 9x+3+9x+3=21x-3 equation:



9x+3+9x+3=21x-3
We move all terms to the left:
9x+3+9x+3-(21x-3)=0
We add all the numbers together, and all the variables
18x-(21x-3)+6=0
We get rid of parentheses
18x-21x+3+6=0
We add all the numbers together, and all the variables
-3x+9=0
We move all terms containing x to the left, all other terms to the right
-3x=-9
x=-9/-3
x=+3

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