20-a=-4a+3(a-7)

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Solution for 20-a=-4a+3(a-7) equation: 


Simplifying
20 + -1a = -4a + 3(a + -7)

Reorder the terms:
20 + -1a = -4a + 3(-7 + a)
20 + -1a = -4a + (-7 * 3 + a * 3)
20 + -1a = -4a + (-21 + 3a)

Reorder the terms:
20 + -1a = -21 + -4a + 3a

Combine like terms: -4a + 3a = -1a
20 + -1a = -21 + -1a

Add 'a' to each side of the equation.
20 + -1a + a = -21 + -1a + a

Combine like terms: -1a + a = 0
20 + 0 = -21 + -1a + a
20 = -21 + -1a + a

Combine like terms: -1a + a = 0
20 = -21 + 0
20 = -21

Solving
20 = -21

Couldn't find a variable to solve for.

This equation is invalid, the left and right sides are not equal, therefore there is no solution.

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