Verified answer

Ola Jenny

180 - x - 3*(90 - x) = 54

180 - x - 270 + 3x = 54

2x = 54 + 90 = 144

x = 72°

pronto

(180-x)-3(90-x)=54

180-x-270+3x=54

2x=54+90

2x=144

x=144/2

x=72º