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3y-42 = 2y+7
3y-2y = 7+42
y = 49
3y - 42 + x + 42 = 180
3(49) - 42 + x + 42 = 180
147 + x = 180
x = 180-147
x = 33
x - y = 33 - 49
= -16
jawaban tdk ada dalam opsi
jika yg ditanya y - x , baru jawabannya D
no 15)
< PSR = 90-57
= 33
jawaban C