(-21x+4)+(20x-9)=

Solution for (-21x+4)+(20x-9)= equation:

Simplifying
(-21x + 4) + (20x + -9) = 0

Reorder the terms:
(4 + -21x) + (20x + -9) = 0

Remove parenthesis around (4 + -21x)
4 + -21x + (20x + -9) = 0

Reorder the terms:
4 + -21x + (-9 + 20x) = 0

Remove parenthesis around (-9 + 20x)
4 + -21x + -9 + 20x = 0

Reorder the terms:
4 + -9 + -21x + 20x = 0

Combine like terms: 4 + -9 = -5
-5 + -21x + 20x = 0

Combine like terms: -21x + 20x = -1x
-5 + -1x = 0

Solving
-5 + -1x = 0

Solving for variable 'x'.

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

Add '5' to each side of the equation.
-5 + 5 + -1x = 0 + 5

Combine like terms: -5 + 5 = 0
0 + -1x = 0 + 5
-1x = 0 + 5

Combine like terms: 0 + 5 = 5
-1x = 5

Divide each side by '-1'.
x = -5

Simplifying
x = -5