7(3+X)=90

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Solution for 7(3+X)=90 equation: 


Simplifying
7(3 + X) = 90
(3 * 7 + X * 7) = 90
(21 + 7X) = 90

Solving
21 + 7X = 90

Solving for variable 'X'.

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

Add '-21' to each side of the equation.
21 + -21 + 7X = 90 + -21

Combine like terms: 21 + -21 = 0
0 + 7X = 90 + -21
7X = 90 + -21

Combine like terms: 90 + -21 = 69
7X = 69

Divide each side by '7'.
X = 9.857142857

Simplifying
X = 9.857142857

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