I was doing my geometry homework earlier and came across a problem: Find m<S if m<S is 20 more than four times its supplement. What I did: m<S= x supplement of m<S: x = (x-180) how I worked it out: x=4(x-180) + 20 x=4x-700 700=3x 233.333... = x My answer for x is obviously wrong because when I try to find m<S, I get 233.33... again: x=4(2.333...-180) +20 4(53.33...)= 213.333... + 20 = 233.3333.... This evidently does not make any sense at all. The problem said "supplement", and 233.333... is most certainly not an angle measure which agree with the definition of supplement, I believe. Please help.