Find the $x-$intercept and the $y-$intercept. Then graph the equation.

$5x+21y=-15$

Find the x$-$intercept. Select the correct choice below and, if necessary, fill in the answer box to complete your choice.

A$.$ The $x-$intercept is $.($Simplify your answer. Type an ordered pair.$)$

B$.$ The equation has no $x-$intercept.