7x-42+28=-21

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Solution for 7x-42+28=-21 equation:


Simplifying
7x + -42 + 28 = -21

Reorder the terms:
-42 + 28 + 7x = -21

Combine like terms: -42 + 28 = -14
-14 + 7x = -21

Solving
-14 + 7x = -21

Solving for variable 'x'.

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

Add '14' to each side of the equation.
-14 + 14 + 7x = -21 + 14

Combine like terms: -14 + 14 = 0
0 + 7x = -21 + 14
7x = -21 + 14

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

Divide each side by '7'.
x = -1

Simplifying
x = -1

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