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=5x + 2 per 7
5. (3a-4) per 7 - (2a-3) per 7
= (3a-4) - (2a-3) per 7
=3a-2a -4 + 3 per 7 (karena - (-3) = +3)
= a -1 per7
yang lainnya dicoba sendiri... kan udh ada contohnya