30=-7.5(x-4.2)

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Solution for 30=-7.5(x-4.2) equation:


Simplifying
30 = -7.5(x + -4.2)

Reorder the terms:
30 = -7.5(-4.2 + x)
30 = (-4.2 * -7.5 + x * -7.5)
30 = (31.5 + -7.5x)

Solving
30 = 31.5 + -7.5x

Solving for variable 'x'.

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

Add '7.5x' to each side of the equation.
30 + 7.5x = 31.5 + -7.5x + 7.5x

Combine like terms: -7.5x + 7.5x = 0.0
30 + 7.5x = 31.5 + 0.0
30 + 7.5x = 31.5

Add '-30' to each side of the equation.
30 + -30 + 7.5x = 31.5 + -30

Combine like terms: 30 + -30 = 0
0 + 7.5x = 31.5 + -30
7.5x = 31.5 + -30

Combine like terms: 31.5 + -30 = 1.5
7.5x = 1.5

Divide each side by '7.5'.
x = 0.2

Simplifying
x = 0.2

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