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3x + 4x = 120 - 75
7x = 45
x = 45 ÷ 7
x = 6.42
sudut a yang mana?
tinggal kaliin aja sama 6.42
7x = 180 - 75
7x =105
x = 105/7 = 15
yang sudut A mana?
misss <A = 4x = 4×15 = 60
misalnya <A = 3x = 3 × 15 = 45