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2K - k = 175
____________ - ----->rumus eliminasi
-K = -150
K = 150
k = 125
B = 25 + k
2B - k = 175
rumus subtitusi :
2 (25 + k ) - k = 175
50+2k -k = 175
k = 175-50
k= 125
B=25+k= 150