-7(1+3x)=-7(x+9)

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Solution for -7(1+3x)=-7(x+9) equation:


Simplifying
-7(1 + 3x) = -7(x + 9)
(1 * -7 + 3x * -7) = -7(x + 9)
(-7 + -21x) = -7(x + 9)

Reorder the terms:
-7 + -21x = -7(9 + x)
-7 + -21x = (9 * -7 + x * -7)
-7 + -21x = (-63 + -7x)

Solving
-7 + -21x = -63 + -7x

Solving for variable 'x'.

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

Add '7x' to each side of the equation.
-7 + -21x + 7x = -63 + -7x + 7x

Combine like terms: -21x + 7x = -14x
-7 + -14x = -63 + -7x + 7x

Combine like terms: -7x + 7x = 0
-7 + -14x = -63 + 0
-7 + -14x = -63

Add '7' to each side of the equation.
-7 + 7 + -14x = -63 + 7

Combine like terms: -7 + 7 = 0
0 + -14x = -63 + 7
-14x = -63 + 7

Combine like terms: -63 + 7 = -56
-14x = -56

Divide each side by '-14'.
x = 4

Simplifying
x = 4

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