3(5+7x)=15

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Solution for 3(5+7x)=15 equation: 


Simplifying
3(5 + 7x) = 15
(5 * 3 + 7x * 3) = 15
(15 + 21x) = 15

Add '-15' to each side of the equation.
15 + -15 + 21x = 15 + -15

Combine like terms: 15 + -15 = 0
0 + 21x = 15 + -15
21x = 15 + -15

Combine like terms: 15 + -15 = 0
21x = 0

Solving
21x = 0

Solving for variable 'x'.

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

Divide each side by '21'.
x = 0

Simplifying
x = 0

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