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5+x=25*0.9^x
We move all terms to the left:
5+x-(25*0.9^x)=0
We get rid of parentheses
x-25*0.9^x+5=0
Wy multiply elements
x+0x+5=0
We add all the numbers together, and all the variables
2x+5=0
We move all terms containing x to the left, all other terms to the right
2x=-5
x=-5/2
x=-2+1/2
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