7x+21=18x-9-3

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Solution for 7x+21=18x-9-3 equation: 



7x+21=18x-9-3

We move all terms to the left:

7x+21-(18x-9-3)=0

We add all the numbers together, and all the variables

7x-(18x-12)+21=0

We get rid of parentheses

7x-18x+12+21=0

We add all the numbers together, and all the variables

-11x+33=0

We move all terms containing x to the left, all other terms to the right

-11x=-33

x=-33/-11

x=+3

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