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brarti (×+25)+(3×-5) = 180
× + 3× + 25 - 5 = 180
4× + 20 = 180
4× = 180 - 20
4× = 160
× = 160÷4 = 40
sudut A = x+25
sudut B = 3x-5
jumlh sudut berpelurus = 180⁰
maka :
sudut A + sudut B = 180⁰
x+25 + 3x-5 = 180⁰
4x + 20 = 180⁰
4x = 180⁰ - 20⁰
x = 160/4
x = 40 ⁰
jadi nilai x = 40⁰