a) 40x + 7z - 4x + 2z - 2x + 5x + 2z + 5 = 39x + 11z +5
b) 4a + 5b + 6c - 5c + 10 + 6a + 8 - 3a - 4b +7c - 5 + 8a = 15a + b + 8c + 13
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a) 40x + 7z - 4x + 2z - 2x + 5x + 2z + 5 = 39x + 11z +5
b) 4a + 5b + 6c - 5c + 10 + 6a + 8 - 3a - 4b +7c - 5 + 8a = 15a + b + 8c + 13