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8x+7x=75.
We move all terms to the left:
8x+7x-(75.)=0
We add all the numbers together, and all the variables
8x+7x-75=0
We add all the numbers together, and all the variables
15x-75=0
We move all terms containing x to the left, all other terms to the right
15x=75
x=75/15
x=5
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