Question 469220
You are being asked to solve for x using the given information:
Angles 1 and 2 are supplementary which means that their sum is 180 degrees.
So if you add angle 1 (60 deg.) and angle 2 (2x+20)deg. and set the  sum equal to 180 degrees, you'll have an equation that will allow you to solve for x.
{{{60+(2x+20) = 180}}} Simplify.
{{{2x+80 = 180}}} Subtract 80 from both sides.
{{{2x = 100}}} Divide both sides by 2.
{{{highlight(x = 50)}}}