7.5=30-4x*4.5

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Solution for 7.5=30-4x*4.5 equation:


Simplifying
7.5 = 30 + -4x * 4.5

Reorder the terms for easier multiplication:
7.5 = 30 + -4 * 4.5x

Multiply -4 * 4.5
7.5 = 30 + -18x

Solving
7.5 = 30 + -18x

Solving for variable 'x'.

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

Add '18x' to each side of the equation.
7.5 + 18x = 30 + -18x + 18x

Combine like terms: -18x + 18x = 0
7.5 + 18x = 30 + 0
7.5 + 18x = 30

Add '-7.5' to each side of the equation.
7.5 + -7.5 + 18x = 30 + -7.5

Combine like terms: 7.5 + -7.5 = 0.0
0.0 + 18x = 30 + -7.5
18x = 30 + -7.5

Combine like terms: 30 + -7.5 = 22.5
18x = 22.5

Divide each side by '18'.
x = 1.25

Simplifying
x = 1.25

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