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1.78=0.42x-2
We move all terms to the left:
1.78-(0.42x-2)=0
We get rid of parentheses
-0.42x+2+1.78=0
We add all the numbers together, and all the variables
-0.42x+3.78=0
We move all terms containing x to the left, all other terms to the right
-0.42x=-3.78
x=-3.78/-0.42
x=+9
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