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-90+5x=99+14x
We move all terms to the left:
-90+5x-(99+14x)=0
We add all the numbers together, and all the variables
5x-(14x+99)-90=0
We get rid of parentheses
5x-14x-99-90=0
We add all the numbers together, and all the variables
-9x-189=0
We move all terms containing x to the left, all other terms to the right
-9x=189
x=189/-9
x=-21
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