.90x=.40(30)+.15(100)

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Solution for .90x=.40(30)+.15(100) equation: 


Simplifying
0.90x = 0.40(30) + 0.15(100)

Multiply 0.40 * 30
0.90x = 12 + 0.15(100)

Multiply 0.15 * 100
0.90x = 12 + 15

Combine like terms: 12 + 15 = 27
0.90x = 27

Solving
0.90x = 27

Solving for variable 'x'.

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

Divide each side by '0.90'.
x = 30

Simplifying
x = 30

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