0.5(x+90)+0.7x=81

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Solution for 0.5(x+90)+0.7x=81 equation:


Simplifying
0.5(x + 90) + 0.7x = 81

Reorder the terms:
0.5(90 + x) + 0.7x = 81
(90 * 0.5 + x * 0.5) + 0.7x = 81
(45 + 0.5x) + 0.7x = 81

Combine like terms: 0.5x + 0.7x = 1.2x
45 + 1.2x = 81

Solving
45 + 1.2x = 81

Solving for variable 'x'.

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

Add '-45' to each side of the equation.
45 + -45 + 1.2x = 81 + -45

Combine like terms: 45 + -45 = 0
0 + 1.2x = 81 + -45
1.2x = 81 + -45

Combine like terms: 81 + -45 = 36
1.2x = 36

Divide each side by '1.2'.
x = 30

Simplifying
x = 30

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