7x+21=-78(x-9)

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Solution for 7x+21=-78(x-9) equation:


Simplifying
7x + 21 = -78(x + -9)

Reorder the terms:
21 + 7x = -78(x + -9)

Reorder the terms:
21 + 7x = -78(-9 + x)
21 + 7x = (-9 * -78 + x * -78)
21 + 7x = (702 + -78x)

Solving
21 + 7x = 702 + -78x

Solving for variable 'x'.

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

Add '78x' to each side of the equation.
21 + 7x + 78x = 702 + -78x + 78x

Combine like terms: 7x + 78x = 85x
21 + 85x = 702 + -78x + 78x

Combine like terms: -78x + 78x = 0
21 + 85x = 702 + 0
21 + 85x = 702

Add '-21' to each side of the equation.
21 + -21 + 85x = 702 + -21

Combine like terms: 21 + -21 = 0
0 + 85x = 702 + -21
85x = 702 + -21

Combine like terms: 702 + -21 = 681
85x = 681

Divide each side by '85'.
x = 8.011764706

Simplifying
x = 8.011764706

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