3(9-z)-45=21z-6(3+4)z

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Solution for 3(9-z)-45=21z-6(3+4)z equation:


Simplifying
3(9 + -1z) + -45 = 21z + -6(3 + 4) * z
(9 * 3 + -1z * 3) + -45 = 21z + -6(3 + 4) * z
(27 + -3z) + -45 = 21z + -6(3 + 4) * z

Reorder the terms:
27 + -45 + -3z = 21z + -6(3 + 4) * z

Combine like terms: 27 + -45 = -18
-18 + -3z = 21z + -6(3 + 4) * z

Combine like terms: 3 + 4 = 7
-18 + -3z = 21z + -6(7) * z

Multiply -6 * 7
-18 + -3z = 21z + -42z

Combine like terms: 21z + -42z = -21z
-18 + -3z = -21z

Solving
-18 + -3z = -21z

Solving for variable 'z'.

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

Add '21z' to each side of the equation.
-18 + -3z + 21z = -21z + 21z

Combine like terms: -3z + 21z = 18z
-18 + 18z = -21z + 21z

Combine like terms: -21z + 21z = 0
-18 + 18z = 0

Add '18' to each side of the equation.
-18 + 18 + 18z = 0 + 18

Combine like terms: -18 + 18 = 0
0 + 18z = 0 + 18
18z = 0 + 18

Combine like terms: 0 + 18 = 18
18z = 18

Divide each side by '18'.
z = 1

Simplifying
z = 1

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