8-7X=66-21X

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Solution for 8-7X=66-21X equation: 


Simplifying
8 + -7X = 66 + -21X

Solving
8 + -7X = 66 + -21X

Solving for variable 'X'.

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

Add '21X' to each side of the equation.
8 + -7X + 21X = 66 + -21X + 21X

Combine like terms: -7X + 21X = 14X
8 + 14X = 66 + -21X + 21X

Combine like terms: -21X + 21X = 0
8 + 14X = 66 + 0
8 + 14X = 66

Add '-8' to each side of the equation.
8 + -8 + 14X = 66 + -8

Combine like terms: 8 + -8 = 0
0 + 14X = 66 + -8
14X = 66 + -8

Combine like terms: 66 + -8 = 58
14X = 58

Divide each side by '14'.
X = 4.142857143

Simplifying
X = 4.142857143

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