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2)-9x+7y-6
pertama - dikali sama kurung sebalah kanan buka kurung cari variabel yg sama dan itubglah
=-4k-3m+3k+5m
=-k+2m
2.(-6x+2y-4) - (3x-5y+2)
=-6x+2y-4-3x+5y-2
=-9x+7y-6