2a-3(a+7)-4(-a+b)=

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Solution for 2a-3(a+7)-4(-a+b)= equation:


Simplifying
2a + -3(a + 7) + -4(-1a + b) = 0

Reorder the terms:
2a + -3(7 + a) + -4(-1a + b) = 0
2a + (7 * -3 + a * -3) + -4(-1a + b) = 0
2a + (-21 + -3a) + -4(-1a + b) = 0
2a + -21 + -3a + (-1a * -4 + b * -4) = 0
2a + -21 + -3a + (4a + -4b) = 0

Reorder the terms:
-21 + 2a + -3a + 4a + -4b = 0

Combine like terms: 2a + -3a = -1a
-21 + -1a + 4a + -4b = 0

Combine like terms: -1a + 4a = 3a
-21 + 3a + -4b = 0

Solving
-21 + 3a + -4b = 0

Solving for variable 'a'.

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

Add '21' to each side of the equation.
-21 + 3a + 21 + -4b = 0 + 21

Reorder the terms:
-21 + 21 + 3a + -4b = 0 + 21

Combine like terms: -21 + 21 = 0
0 + 3a + -4b = 0 + 21
3a + -4b = 0 + 21

Combine like terms: 0 + 21 = 21
3a + -4b = 21

Add '4b' to each side of the equation.
3a + -4b + 4b = 21 + 4b

Combine like terms: -4b + 4b = 0
3a + 0 = 21 + 4b
3a = 21 + 4b

Divide each side by '3'.
a = 7 + 1.333333333b

Simplifying
a = 7 + 1.333333333b

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