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180= 9x
x = 20
9x = 180
x = 180/9
x = 20
10) x+35+ 2x -5 = 180
3x +30 = 180
3x = 180-30
= 150
x = 150/3
= 50
sudut q4 = 2x - 5
= 2 * 50 - 5
= 100 -5
= 95