100(0.1x+0.03(7-x))=(0.05(7))

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Solution for 100(0.1x+0.03(7-x))=(0.05(7)) equation:


Simplifying
100(0.1x + 0.03(7 + -1x)) = (0.05(7))
100(0.1x + (7 * 0.03 + -1x * 0.03)) = (0.05(7))
100(0.1x + (0.21 + -0.03x)) = (0.05(7))

Reorder the terms:
100(0.21 + 0.1x + -0.03x) = (0.05(7))

Combine like terms: 0.1x + -0.03x = 0.07x
100(0.21 + 0.07x) = (0.05(7))
(0.21 * 100 + 0.07x * 100) = (0.05(7))
(21 + 7x) = (0.05(7))

Multiply 0.05 * 7
21 + 7x = (0.35)
21 + 7x = 0.35

Solving
21 + 7x = 0.35

Solving for variable 'x'.

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

Add '-21' to each side of the equation.
21 + -21 + 7x = 0.35 + -21

Combine like terms: 21 + -21 = 0
0 + 7x = 0.35 + -21
7x = 0.35 + -21

Combine like terms: 0.35 + -21 = -20.65
7x = -20.65

Divide each side by '7'.
x = -2.95

Simplifying
x = -2.95

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