3(7+5)=21x-9

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Solution for 3(7+5)=21x-9 equation:


Simplifying
3(7 + 5) = 21x + -9

Combine like terms: 7 + 5 = 12
3(12) = 21x + -9

Multiply 3 * 12
36 = 21x + -9

Reorder the terms:
36 = -9 + 21x

Solving
36 = -9 + 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.
36 + -21x = -9 + 21x + -21x

Combine like terms: 21x + -21x = 0
36 + -21x = -9 + 0
36 + -21x = -9

Add '-36' to each side of the equation.
36 + -36 + -21x = -9 + -36

Combine like terms: 36 + -36 = 0
0 + -21x = -9 + -36
-21x = -9 + -36

Combine like terms: -9 + -36 = -45
-21x = -45

Divide each side by '-21'.
x = 2.142857143

Simplifying
x = 2.142857143

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