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x/1.8=-2.1
We move all terms to the left:
x/1.8-(-2.1)=0
We add all the numbers together, and all the variables
x/1.8+2.1=0
We multiply all the terms by the denominator
x+(2.1)*1.8=0
We add all the numbers together, and all the variables
x+3.78=0
We move all terms containing x to the left, all other terms to the right
x=-3.78
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