3x+7x+42=400

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Solution for 3x+7x+42=400 equation:


Simplifying
3x + 7x + 42 = 400

Reorder the terms:
42 + 3x + 7x = 400

Combine like terms: 3x + 7x = 10x
42 + 10x = 400

Solving
42 + 10x = 400

Solving for variable 'x'.

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

Add '-42' to each side of the equation.
42 + -42 + 10x = 400 + -42

Combine like terms: 42 + -42 = 0
0 + 10x = 400 + -42
10x = 400 + -42

Combine like terms: 400 + -42 = 358
10x = 358

Divide each side by '10'.
x = 35.8

Simplifying
x = 35.8

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