7x-(4x-9)=30

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Solution for 7x-(4x-9)=30 equation:


Simplifying
7x + -1(4x + -9) = 30

Reorder the terms:
7x + -1(-9 + 4x) = 30
7x + (-9 * -1 + 4x * -1) = 30
7x + (9 + -4x) = 30

Reorder the terms:
9 + 7x + -4x = 30

Combine like terms: 7x + -4x = 3x
9 + 3x = 30

Solving
9 + 3x = 30

Solving for variable 'x'.

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

Add '-9' to each side of the equation.
9 + -9 + 3x = 30 + -9

Combine like terms: 9 + -9 = 0
0 + 3x = 30 + -9
3x = 30 + -9

Combine like terms: 30 + -9 = 21
3x = 21

Divide each side by '3'.
x = 7

Simplifying
x = 7

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