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5x = 180
x = 36
120 + 100 + m + n + 360 - x = 540
580 + m + n - x = 540
40 = x - m - n
m + n + x + 220 = 360
m + n + x = 140
x - 140 = - m - n
40 = x + x - 140
180 = 2x
90 = x