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7x+9x-63=105-5x
We move all terms to the left:
7x+9x-63-(105-5x)=0
We add all the numbers together, and all the variables
7x+9x-(-5x+105)-63=0
We add all the numbers together, and all the variables
16x-(-5x+105)-63=0
We get rid of parentheses
16x+5x-105-63=0
We add all the numbers together, and all the variables
21x-168=0
We move all terms containing x to the left, all other terms to the right
21x=168
x=168/21
x=8
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