.90x+.20(90)=.80(x+90)

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Solution for .90x+.20(90)=.80(x+90) equation:


Simplifying
0.90x + 0.20(90) = 0.80(x + 90)

Multiply 0.20 * 90
0.90x + 18 = 0.80(x + 90)

Reorder the terms:
18 + 0.90x = 0.80(x + 90)

Reorder the terms:
18 + 0.90x = 0.80(90 + x)
18 + 0.90x = (90 * 0.80 + x * 0.80)
18 + 0.90x = (72 + 0.80x)

Solving
18 + 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.
18 + 0.90x + -0.80x = 72 + 0.80x + -0.80x

Combine like terms: 0.90x + -0.80x = 0.1x
18 + 0.1x = 72 + 0.80x + -0.80x

Combine like terms: 0.80x + -0.80x = 0.00
18 + 0.1x = 72 + 0.00
18 + 0.1x = 72

Add '-18' to each side of the equation.
18 + -18 + 0.1x = 72 + -18

Combine like terms: 18 + -18 = 0
0 + 0.1x = 72 + -18
0.1x = 72 + -18

Combine like terms: 72 + -18 = 54
0.1x = 54

Divide each side by '0.1'.
x = 540

Simplifying
x = 540

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