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2.3x+4.2=-11.21
We move all terms to the left:
2.3x+4.2-(-11.21)=0
We add all the numbers together, and all the variables
2.3x+15.41=0
We move all terms containing x to the left, all other terms to the right
2.3x=-15.41
x=-15.41/2.3
x=-6+1/1.4285714285714
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