42-21+2n+7=4*10+3

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Solution for 42-21+2n+7=4*10+3 equation:


Simplifying
42 + -21 + 2n + 7 = 4 * 10 + 3

Reorder the terms:
42 + -21 + 7 + 2n = 4 * 10 + 3

Combine like terms: 42 + -21 = 21
21 + 7 + 2n = 4 * 10 + 3

Combine like terms: 21 + 7 = 28
28 + 2n = 4 * 10 + 3

Multiply 4 * 10
28 + 2n = 40 + 3

Combine like terms: 40 + 3 = 43
28 + 2n = 43

Solving
28 + 2n = 43

Solving for variable 'n'.

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

Add '-28' to each side of the equation.
28 + -28 + 2n = 43 + -28

Combine like terms: 28 + -28 = 0
0 + 2n = 43 + -28
2n = 43 + -28

Combine like terms: 43 + -28 = 15
2n = 15

Divide each side by '2'.
n = 7.5

Simplifying
n = 7.5

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