Final answer:
To solve for x in the equation (2x+21)/5=3, multiply both sides by 5. Then, isolate the variable and solve for x. The solution is x=-3.
Step-by-step explanation:
To solve for x in the equation (2x+21)/5=3, you can begin by multiplying both sides of the equation by 5 to get rid of the denominator. This gives you 2x+21=15. Next, subtract 21 from both sides of the equation to isolate the variable. This gives you 2x=15-21, which simplifies to 2x=-6. Finally, divide both sides of the equation by 2 to solve for x. This gives you x=-6/2, which simplifies to x=-3. Therefore, the solution to the equation is x=-3.