Perform the indicated operations. Write the resulting polynomial in standard form: (6x(7)+3x(5)+3x)+(8x(7)+5x(5)-7x).
a) 14x⁷ + 8x⁵ - 4x
b) 14x⁷ + 8x⁵ - 4x²
c) 14x⁷ + 8x⁵ - 10x
d) 14x⁷ + 8x⁵ - 4