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7x+9x-50=75-9x
We move all terms to the left:
7x+9x-50-(75-9x)=0
We add all the numbers together, and all the variables
7x+9x-(-9x+75)-50=0
We add all the numbers together, and all the variables
16x-(-9x+75)-50=0
We get rid of parentheses
16x+9x-75-50=0
We add all the numbers together, and all the variables
25x-125=0
We move all terms containing x to the left, all other terms to the right
25x=125
x=125/25
x=5
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