E=(3-x)(3+2x)+7x-21

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Solution for E=(3-x)(3+2x)+7x-21 equation: 


Simplifying
E = (3 + -1x)(3 + 2x) + 7x + -21

Multiply (3 + -1x) * (3 + 2x)
E = (3(3 + 2x) + -1x * (3 + 2x)) + 7x + -21
E = ((3 * 3 + 2x * 3) + -1x * (3 + 2x)) + 7x + -21
E = ((9 + 6x) + -1x * (3 + 2x)) + 7x + -21
E = (9 + 6x + (3 * -1x + 2x * -1x)) + 7x + -21
E = (9 + 6x + (-3x + -2x2)) + 7x + -21

Combine like terms: 6x + -3x = 3x
E = (9 + 3x + -2x2) + 7x + -21

Reorder the terms:
E = 9 + -21 + 3x + 7x + -2x2

Combine like terms: 9 + -21 = -12
E = -12 + 3x + 7x + -2x2

Combine like terms: 3x + 7x = 10x
E = -12 + 10x + -2x2

Solving
E = -12 + 10x + -2x2

Solving for variable 'E'.

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

Simplifying
E = -12 + 10x + -2x2

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