-20-9z=-5-7(7z-15)

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Solution for -20-9z=-5-7(7z-15) equation:


Simplifying
-20 + -9z = -5 + -7(7z + -15)

Reorder the terms:
-20 + -9z = -5 + -7(-15 + 7z)
-20 + -9z = -5 + (-15 * -7 + 7z * -7)
-20 + -9z = -5 + (105 + -49z)

Combine like terms: -5 + 105 = 100
-20 + -9z = 100 + -49z

Solving
-20 + -9z = 100 + -49z

Solving for variable 'z'.

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

Add '49z' to each side of the equation.
-20 + -9z + 49z = 100 + -49z + 49z

Combine like terms: -9z + 49z = 40z
-20 + 40z = 100 + -49z + 49z

Combine like terms: -49z + 49z = 0
-20 + 40z = 100 + 0
-20 + 40z = 100

Add '20' to each side of the equation.
-20 + 20 + 40z = 100 + 20

Combine like terms: -20 + 20 = 0
0 + 40z = 100 + 20
40z = 100 + 20

Combine like terms: 100 + 20 = 120
40z = 120

Divide each side by '40'.
z = 3

Simplifying
z = 3

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