d=-9x^2-4*0.5x^2*40.5

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Solution for d=-9x^2-4*0.5x^2*40.5 equation: 


Simplifying
d = -9x2 + -4 * 0.5x2 * 40.5

Reorder the terms for easier multiplication:
d = -9x2 + -4 * 0.5 * 40.5x2

Multiply -4 * 0.5
d = -9x2 + -2 * 40.5x2

Multiply -2 * 40.5
d = -9x2 + -81x2

Combine like terms: -9x2 + -81x2 = -90x2
d = -90x2

Solving
d = -90x2

Solving for variable 'd'.

Move all terms containing d to the left, all other terms to the right.

Simplifying
d = -90x2

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