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0.90(x+100)+0.10x=115
We move all terms to the left:
0.90(x+100)+0.10x-(115)=0
We add all the numbers together, and all the variables
0.10x+0.90(x+100)-115=0
We multiply parentheses
0.10x+0.9x+90-115=0
We add all the numbers together, and all the variables
x-25=0
We move all terms containing x to the left, all other terms to the right
x=25
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