5 + 1.8 divided by (x + 3) = 12,

5+1.8÷(x+3)=12.2
1.8÷(x+3)=12.2-5
1.8÷(x+3)=7.2
x+3=1.8÷7.2
x+3=0.25
x=0.25-3
x=-2.75

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