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7x+4x-15=75-4x
We move all terms to the left:
7x+4x-15-(75-4x)=0
We add all the numbers together, and all the variables
7x+4x-(-4x+75)-15=0
We add all the numbers together, and all the variables
11x-(-4x+75)-15=0
We get rid of parentheses
11x+4x-75-15=0
We add all the numbers together, and all the variables
15x-90=0
We move all terms containing x to the left, all other terms to the right
15x=90
x=90/15
x=6
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