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7. Simplify the algebraic expression: (6x? - 4x - 1) + (7x} + 5x2 - 4x + 7)
a. 13x -3x + 6
c. 13x3 + 5x2 - 8x + 6
b. 13x3 + 5x² + 6
d. 13x3 + 5x2 + 8x + 6​