Calcule as expressões embaixo?

a-)(5x² - 3x +2) . (7x(5) - 3x)

b-)(5x² - 3x +2) - (7x(5) - 3x)

c-)(5x² - 3x +2) + (7x(5) - 3x)

d-)-6.(-3x² - 9x + 3)

obs : 5 em parênteses esta em cima do x

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