Let's solve for x.<span><span><span>3x</span>+<span>4y</span></span>=36</span>Step 1: Add -4y to both sides.<span><span><span><span>3x</span>+<span>4y</span></span>+<span>−<span>4y</span></span></span>=<span>36+<span>−<span>4y</span></span></span></span><span><span>3x</span>=<span><span>−<span>4y</span></span>+36</span></span>Step 2: Divide both sides by 3.<span><span><span>3x</span>3</span>=<span><span><span>−<span>4y</span></span>+36</span>3</span></span><span>x=<span><span><span><span>−4</span>3</span>y</span>+12</span></span>Answer:<span>x=<span><span><span><span>−4</span>3</span>y</span>+<span>12