-87-9X=51-15X

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Solution for -87-9X=51-15X equation:


Simplifying
-87 + -9X = 51 + -15X

Solving
-87 + -9X = 51 + -15X

Solving for variable 'X'.

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

Add '15X' to each side of the equation.
-87 + -9X + 15X = 51 + -15X + 15X

Combine like terms: -9X + 15X = 6X
-87 + 6X = 51 + -15X + 15X

Combine like terms: -15X + 15X = 0
-87 + 6X = 51 + 0
-87 + 6X = 51

Add '87' to each side of the equation.
-87 + 87 + 6X = 51 + 87

Combine like terms: -87 + 87 = 0
0 + 6X = 51 + 87
6X = 51 + 87

Combine like terms: 51 + 87 = 138
6X = 138

Divide each side by '6'.
X = 23

Simplifying
X = 23

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