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15.12+0.9x=15.87+0.15x
We move all terms to the left:
15.12+0.9x-(15.87+0.15x)=0
We add all the numbers together, and all the variables
0.9x-(0.15x+15.87)+15.12=0
We get rid of parentheses
0.9x-0.15x-15.87+15.12=0
We add all the numbers together, and all the variables
0.75x-0.75=0
We move all terms containing x to the left, all other terms to the right
0.75x=0.75
x=0.75/0.75
x=1
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