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90-x = (3/4)*(180-x)-60 // - (3/4)*(180-x)-60
60-((3/4)*(180-x))-x+90 = 0
(-3/4)*(180-x)-x+60+90 = 0
60-3/4*(180-x)-x+90 = 0
60-3/4*(180-x)-x+90 = 0
60-1/4*x-135+90 = 0
90-1/4*x-75 = 0
15-1/4*x = 0
15-1/4*x = 0
15-1/4*x = 0 // - 15
-1/4*x = -15 // : -1/4
x = -15/(-1/4)
x = 60
x = 60
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