Answer:
x=6
Step-by-step explanation:
We have the equation 12+3x=30, we need to calculate the value of x:
\(12+3x=30\), subtract 12 in both sides
\(12+3x-12=30-12\)
\(3x=18\), divide both sides in 3
\(\frac{3x}{3}=\frac{18}{3}\)
\(x=6\)
Now to see if this statement is true we have to replace in 12+3x=30 with x=6,
\(12+3x=30\\12+3.6=30\\12+18=30\\30=30\)
Then x=6 makes the sentence true.
