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15x=19x+20.8
We move all terms to the left:
15x-(19x+20.8)=0
We get rid of parentheses
15x-19x-20.8=0
We add all the numbers together, and all the variables
-4x-20.8=0
We move all terms containing x to the left, all other terms to the right
-4x=20.8
x=20.8/-4
x=-5+0.8/4
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