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Verified answer
2x-42+5x+5=1807x - 37 =180
7x= 180+37
7x= 217
x=217/7
x= 31
masukkan x ke B
2x-42 = 2(31)-42 =62 - 42 = 20
180= A + B + C
180= A + 78 + 20 = A + 98
180=A+98
A=180 - 98 =82