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8x+9x-84=105-4x
We move all terms to the left:
8x+9x-84-(105-4x)=0
We add all the numbers together, and all the variables
8x+9x-(-4x+105)-84=0
We add all the numbers together, and all the variables
17x-(-4x+105)-84=0
We get rid of parentheses
17x+4x-105-84=0
We add all the numbers together, and all the variables
21x-189=0
We move all terms containing x to the left, all other terms to the right
21x=189
x=189/21
x=9
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