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2x + x+40 + 4x + 35 = 180
7x + 75 = 180
7x = 180 - 75
7x = 105
x = 15
2x + x + 40 + 4x + 35 = 180
7x + 75 = 180
7x = 180 - 75
7x = 105
x = 15
Jadi, nilai x adalah 15.