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b) 4m + 2n - 3 + m - (n + 1) = 5m + n - 4
c)-2t + u - (w + t- 1) + w = -3t + u + 1
d) -3x² -( 2x - 1 - 5x²) + 3 -( 7x² - 3x) = -5x² + x + 4