Answer:
[tex]3x + 6 = 21 \\ 3x = 21 - 6 \\ 3x = 15 \\ x = \frac{15}{3} \\ x = 5[/tex]
Answer: x=5
Step-by-step explanation:
step 1:
put all the coefficients on one side and all the variables on the other, 3x=21-6
step 2: solve the sides, 3x=15
step 3: divide, 3x/3= 15/3
step 4: simplify: x=5
