7x+x-3(x-10)=20

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Solution for 7x+x-3(x-10)=20 equation:


Simplifying
7x + x + -3(x + -10) = 20

Reorder the terms:
7x + x + -3(-10 + x) = 20
7x + x + (-10 * -3 + x * -3) = 20
7x + x + (30 + -3x) = 20

Reorder the terms:
30 + 7x + x + -3x = 20

Combine like terms: 7x + x = 8x
30 + 8x + -3x = 20

Combine like terms: 8x + -3x = 5x
30 + 5x = 20

Solving
30 + 5x = 20

Solving for variable 'x'.

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

Add '-30' to each side of the equation.
30 + -30 + 5x = 20 + -30

Combine like terms: 30 + -30 = 0
0 + 5x = 20 + -30
5x = 20 + -30

Combine like terms: 20 + -30 = -10
5x = -10

Divide each side by '5'.
x = -2

Simplifying
x = -2

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