7x+[-5(3-x)]-a=12+3x

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Solution for 7x+[-5(3-x)]-a=12+3x equation:


Simplifying
7x + [-5(3 + -1x)] + -1a = 12 + 3x
7x + [(3 * -5 + -1x * -5)] + -1a = 12 + 3x
7x + [(-15 + 5x)] + -1a = 12 + 3x
7x + [-15 + 5x] + -1a = 12 + 3x

Remove brackets around [-15 + 5x]
7x + -15 + 5x + -1a = 12 + 3x

Reorder the terms:
-15 + -1a + 7x + 5x = 12 + 3x

Combine like terms: 7x + 5x = 12x
-15 + -1a + 12x = 12 + 3x

Solving
-15 + -1a + 12x = 12 + 3x

Solving for variable 'a'.

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

Add '15' to each side of the equation.
-15 + -1a + 15 + 12x = 12 + 15 + 3x

Reorder the terms:
-15 + 15 + -1a + 12x = 12 + 15 + 3x

Combine like terms: -15 + 15 = 0
0 + -1a + 12x = 12 + 15 + 3x
-1a + 12x = 12 + 15 + 3x

Combine like terms: 12 + 15 = 27
-1a + 12x = 27 + 3x

Add '-12x' to each side of the equation.
-1a + 12x + -12x = 27 + 3x + -12x

Combine like terms: 12x + -12x = 0
-1a + 0 = 27 + 3x + -12x
-1a = 27 + 3x + -12x

Combine like terms: 3x + -12x = -9x
-1a = 27 + -9x

Divide each side by '-1'.
a = -27 + 9x

Simplifying
a = -27 + 9x

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