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-0.51x+0.21x=6.3
We move all terms to the left:
-0.51x+0.21x-(6.3)=0
We add all the numbers together, and all the variables
-0.3x-6.3=0
We move all terms containing x to the left, all other terms to the right
-0.3x=6.3
x=6.3/-0.3
x=-21
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