3x(4x+3x)=21

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Solution for 3x(4x+3x)=21 equation:


Simplifying
3x(4x + 3x) = 21

Combine like terms: 4x + 3x = 7x
3x(7x) = 21

Remove parenthesis around (7x)
3x * 7x = 21

Reorder the terms for easier multiplication:
3 * 7x * x = 21

Multiply 3 * 7
21x * x = 21

Multiply x * x
21x2 = 21

Solving
21x2 = 21

Solving for variable 'x'.

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

Divide each side by '21'.
x2 = 1

Simplifying
x2 = 1

Take the square root of each side:
x = {-1, 1}

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