0.4(4z+7)+7.2=0.5(4z-4)

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Solution for 0.4(4z+7)+7.2=0.5(4z-4) equation:


Simplifying
0.4(4z + 7) + 7.2 = 0.5(4z + -4)

Reorder the terms:
0.4(7 + 4z) + 7.2 = 0.5(4z + -4)
(7 * 0.4 + 4z * 0.4) + 7.2 = 0.5(4z + -4)
(2.8 + 1.6z) + 7.2 = 0.5(4z + -4)

Reorder the terms:
2.8 + 7.2 + 1.6z = 0.5(4z + -4)

Combine like terms: 2.8 + 7.2 = 10
10 + 1.6z = 0.5(4z + -4)

Reorder the terms:
10 + 1.6z = 0.5(-4 + 4z)
10 + 1.6z = (-4 * 0.5 + 4z * 0.5)
10 + 1.6z = (-2 + 2z)

Solving
10 + 1.6z = -2 + 2z

Solving for variable 'z'.

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

Add '-2z' to each side of the equation.
10 + 1.6z + -2z = -2 + 2z + -2z

Combine like terms: 1.6z + -2z = -0.4z
10 + -0.4z = -2 + 2z + -2z

Combine like terms: 2z + -2z = 0
10 + -0.4z = -2 + 0
10 + -0.4z = -2

Add '-10' to each side of the equation.
10 + -10 + -0.4z = -2 + -10

Combine like terms: 10 + -10 = 0
0 + -0.4z = -2 + -10
-0.4z = -2 + -10

Combine like terms: -2 + -10 = -12
-0.4z = -12

Divide each side by '-0.4'.
z = 30

Simplifying
z = 30

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