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5.1x=-0.3x-21.6
We move all terms to the left:
5.1x-(-0.3x-21.6)=0
We get rid of parentheses
5.1x+0.3x+21.6=0
We add all the numbers together, and all the variables
5.4x+21.6=0
We move all terms containing x to the left, all other terms to the right
5.4x=-21.6
x=-21.6/5.4
x=-4
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