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5x+10(255-x)+25(255-x)=4125
We move all terms to the left:
5x+10(255-x)+25(255-x)-(4125)=0
We add all the numbers together, and all the variables
5x+10(-1x+255)+25(-1x+255)-4125=0
We multiply parentheses
5x-10x-25x+2550+6375-4125=0
We add all the numbers together, and all the variables
-30x+4800=0
We move all terms containing x to the left, all other terms to the right
-30x=-4800
x=-4800/-30
x=+160
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