7x+9 - 2x+3+5x+6, 8a+5b-9 - 8a+2b-4+3b-5, 2(3t+4q) - 6t+8q, 36t+48q - 12(3t+4q), 7x+1 - 2x+1+5x, 2a-1 - -3a+2+5a-3, 6x+20y - 3(2x)+4y(5), -4m+2 - 5m+2-9m,

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