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0.5x+21=5.6
We move all terms to the left:
0.5x+21-(5.6)=0
We add all the numbers together, and all the variables
0.5x+15.4=0
We move all terms containing x to the left, all other terms to the right
0.5x=-15.4
x=-15.4/0.5
x=-30+0.4/0.5
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