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15x+15(x-4)=500
We move all terms to the left:
15x+15(x-4)-(500)=0
We multiply parentheses
15x+15x-60-500=0
We add all the numbers together, and all the variables
30x-560=0
We move all terms containing x to the left, all other terms to the right
30x=560
x=560/30
x=18+2/3
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