21(3+3x)+21(3-x)=21*40

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Solution for 21(3+3x)+21(3-x)=21*40 equation:


Simplifying
21(3 + 3x) + 21(3 + -1x) = 21 * 40
(3 * 21 + 3x * 21) + 21(3 + -1x) = 21 * 40
(63 + 63x) + 21(3 + -1x) = 21 * 40
63 + 63x + (3 * 21 + -1x * 21) = 21 * 40
63 + 63x + (63 + -21x) = 21 * 40

Reorder the terms:
63 + 63 + 63x + -21x = 21 * 40

Combine like terms: 63 + 63 = 126
126 + 63x + -21x = 21 * 40

Combine like terms: 63x + -21x = 42x
126 + 42x = 21 * 40

Multiply 21 * 40
126 + 42x = 840

Solving
126 + 42x = 840

Solving for variable 'x'.

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

Add '-126' to each side of the equation.
126 + -126 + 42x = 840 + -126

Combine like terms: 126 + -126 = 0
0 + 42x = 840 + -126
42x = 840 + -126

Combine like terms: 840 + -126 = 714
42x = 714

Divide each side by '42'.
x = 17

Simplifying
x = 17

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