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15.5+0.5x=19
We move all terms to the left:
15.5+0.5x-(19)=0
We add all the numbers together, and all the variables
0.5x-3.5=0
We move all terms containing x to the left, all other terms to the right
0.5x=3.5
x=3.5/0.5
x=7
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