.90x+.30(90)=.80(x+90)

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Solution for .90x+.30(90)=.80(x+90) equation:


Simplifying
0.90x + 0.30(90) = 0.80(x + 90)

Multiply 0.30 * 90
0.90x + 27 = 0.80(x + 90)

Reorder the terms:
27 + 0.90x = 0.80(x + 90)

Reorder the terms:
27 + 0.90x = 0.80(90 + x)
27 + 0.90x = (90 * 0.80 + x * 0.80)
27 + 0.90x = (72 + 0.80x)

Solving
27 + 0.90x = 72 + 0.80x

Solving for variable 'x'.

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

Add '-0.80x' to each side of the equation.
27 + 0.90x + -0.80x = 72 + 0.80x + -0.80x

Combine like terms: 0.90x + -0.80x = 0.1x
27 + 0.1x = 72 + 0.80x + -0.80x

Combine like terms: 0.80x + -0.80x = 0.00
27 + 0.1x = 72 + 0.00
27 + 0.1x = 72

Add '-27' to each side of the equation.
27 + -27 + 0.1x = 72 + -27

Combine like terms: 27 + -27 = 0
0 + 0.1x = 72 + -27
0.1x = 72 + -27

Combine like terms: 72 + -27 = 45
0.1x = 45

Divide each side by '0.1'.
x = 450

Simplifying
x = 450

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