Question

1. solve and check

13 + 7x = 27
answer:

Explanation:

Step1: Isolate the term with $x$

Subtract 13 from both sides:
$13 + 7x - 13 = 27 - 13$
$7x = 14$

Step2: Solve for $x$

Divide both sides by 7:
$\frac{7x}{7} = \frac{14}{7}$
$x = 2$

Step3: Check the solution

Substitute $x=2$ into the original equation:
$13 + 7(2) = 13 + 14 = 27$
The left side equals the right side, so the solution is valid.

Answer:

$x=2$