-4x-15+6x-21=6

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Solution for -4x-15+6x-21=6 equation:


Simplifying
-4x + -15 + 6x + -21 = 6

Reorder the terms:
-15 + -21 + -4x + 6x = 6

Combine like terms: -15 + -21 = -36
-36 + -4x + 6x = 6

Combine like terms: -4x + 6x = 2x
-36 + 2x = 6

Solving
-36 + 2x = 6

Solving for variable 'x'.

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

Add '36' to each side of the equation.
-36 + 36 + 2x = 6 + 36

Combine like terms: -36 + 36 = 0
0 + 2x = 6 + 36
2x = 6 + 36

Combine like terms: 6 + 36 = 42
2x = 42

Divide each side by '2'.
x = 21

Simplifying
x = 21

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