3x*2.5x=30

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Solution for 3x*2.5x=30 equation: 


Simplifying
3x * 2.5x = 30

Reorder the terms for easier multiplication:
3 * 2.5x * x = 30

Multiply 3 * 2.5
7.5x * x = 30

Multiply x * x
7.5x2 = 30

Solving
7.5x2 = 30

Solving for variable 'x'.

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

Divide each side by '7.5'.
x2 = 4

Simplifying
x2 = 4

Take the square root of each side:
x = {-2, 2}

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