2-7x+8-4x=21

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Solution for 2-7x+8-4x=21 equation:


Simplifying
2 + -7x + 8 + -4x = 21

Reorder the terms:
2 + 8 + -7x + -4x = 21

Combine like terms: 2 + 8 = 10
10 + -7x + -4x = 21

Combine like terms: -7x + -4x = -11x
10 + -11x = 21

Solving
10 + -11x = 21

Solving for variable 'x'.

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

Add '-10' to each side of the equation.
10 + -10 + -11x = 21 + -10

Combine like terms: 10 + -10 = 0
0 + -11x = 21 + -10
-11x = 21 + -10

Combine like terms: 21 + -10 = 11
-11x = 11

Divide each side by '-11'.
x = -1

Simplifying
x = -1

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