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x + x - 15 = 177
jawaban soal b
x + x - 15 = 177
2x-15 = 177
2x = 177 + 15
2x = 132
x = 132/2
x = 66
2x - 15 = 117
b) bilangan tersebut
2x - 15 =117
2x = 117 + 15
= 132
x = 132/2
= 66