6x-(4x-7)=21

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Solution for 6x-(4x-7)=21 equation:


Simplifying
6x + -1(4x + -7) = 21

Reorder the terms:
6x + -1(-7 + 4x) = 21
6x + (-7 * -1 + 4x * -1) = 21
6x + (7 + -4x) = 21

Reorder the terms:
7 + 6x + -4x = 21

Combine like terms: 6x + -4x = 2x
7 + 2x = 21

Solving
7 + 2x = 21

Solving for variable 'x'.

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

Add '-7' to each side of the equation.
7 + -7 + 2x = 21 + -7

Combine like terms: 7 + -7 = 0
0 + 2x = 21 + -7
2x = 21 + -7

Combine like terms: 21 + -7 = 14
2x = 14

Divide each side by '2'.
x = 7

Simplifying
x = 7

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