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-4=3(x)-0.9
We move all terms to the left:
-4-(3(x)-0.9)=0
We get rid of parentheses
-3x+0.9-4=0
We add all the numbers together, and all the variables
-3x-3.1=0
We move all terms containing x to the left, all other terms to the right
-3x=3.1
x=3.1/-3
x=-1+0.1/3
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