7[5z-3]=4[10z-9]

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Solution for 7[5z-3]=4[10z-9] equation:


Simplifying
7[5z + -3] = 4[10z + -9]

Reorder the terms:
7[-3 + 5z] = 4[10z + -9]
[-3 * 7 + 5z * 7] = 4[10z + -9]
[-21 + 35z] = 4[10z + -9]

Reorder the terms:
-21 + 35z = 4[-9 + 10z]
-21 + 35z = [-9 * 4 + 10z * 4]
-21 + 35z = [-36 + 40z]

Solving
-21 + 35z = -36 + 40z

Solving for variable 'z'.

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

Add '-40z' to each side of the equation.
-21 + 35z + -40z = -36 + 40z + -40z

Combine like terms: 35z + -40z = -5z
-21 + -5z = -36 + 40z + -40z

Combine like terms: 40z + -40z = 0
-21 + -5z = -36 + 0
-21 + -5z = -36

Add '21' to each side of the equation.
-21 + 21 + -5z = -36 + 21

Combine like terms: -21 + 21 = 0
0 + -5z = -36 + 21
-5z = -36 + 21

Combine like terms: -36 + 21 = -15
-5z = -15

Divide each side by '-5'.
z = 3

Simplifying
z = 3

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