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

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

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

Remove parenthesis around (3a + -7b)
3a + -7b + -1(4a + -1b) = 0
3a + -7b + (4a * -1 + -1b * -1) = 0
3a + -7b + (-4a + 1b) = 0

Reorder the terms:
3a + -4a + -7b + 1b = 0

Combine like terms: 3a + -4a = -1a
-1a + -7b + 1b = 0

Combine like terms: -7b + 1b = -6b
-1a + -6b = 0

Solving
-1a + -6b = 0

Solving for variable 'a'.

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

Add '6b' to each side of the equation.
-1a + -6b + 6b = 0 + 6b

Combine like terms: -6b + 6b = 0
-1a + 0 = 0 + 6b
-1a = 0 + 6b
Remove the zero:
-1a = 6b

Divide each side by '-1'.
a = -6b

Simplifying
a = -6b