# Step-by-step Solution

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$\tan\left(x\right)=-4$

## Step-by-step explanation

Problem to solve:

$3tanx\:+\:15\:=\:3$
1

Subtract $15$ from both sides of the equation

$3\tan\left(x\right)=-12$
2

Divide both sides of the equation by $3$

$\tan\left(x\right)=-4$

$\tan\left(x\right)=-4$
$3tanx\:+\:15\:=\:3$