E=7(3-x)+(x+4)(x-5)

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Solution for E=7(3-x)+(x+4)(x-5) equation: 


Simplifying
E = 7(3 + -1x) + (x + 4)(x + -5)
E = (3 * 7 + -1x * 7) + (x + 4)(x + -5)
E = (21 + -7x) + (x + 4)(x + -5)

Reorder the terms:
E = 21 + -7x + (4 + x)(x + -5)

Reorder the terms:
E = 21 + -7x + (4 + x)(-5 + x)

Multiply (4 + x) * (-5 + x)
E = 21 + -7x + (4(-5 + x) + x(-5 + x))
E = 21 + -7x + ((-5 * 4 + x * 4) + x(-5 + x))
E = 21 + -7x + ((-20 + 4x) + x(-5 + x))
E = 21 + -7x + (-20 + 4x + (-5 * x + x * x))
E = 21 + -7x + (-20 + 4x + (-5x + x2))

Combine like terms: 4x + -5x = -1x
E = 21 + -7x + (-20 + -1x + x2)

Reorder the terms:
E = 21 + -20 + -7x + -1x + x2

Combine like terms: 21 + -20 = 1
E = 1 + -7x + -1x + x2

Combine like terms: -7x + -1x = -8x
E = 1 + -8x + x2

Solving
E = 1 + -8x + x2

Solving for variable 'E'.

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

Simplifying
E = 1 + -8x + x2

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