7x-3(4x-5)=15+21

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Solution for 7x-3(4x-5)=15+21 equation:


Simplifying
7x + -3(4x + -5) = 15 + 21

Reorder the terms:
7x + -3(-5 + 4x) = 15 + 21
7x + (-5 * -3 + 4x * -3) = 15 + 21
7x + (15 + -12x) = 15 + 21

Reorder the terms:
15 + 7x + -12x = 15 + 21

Combine like terms: 7x + -12x = -5x
15 + -5x = 15 + 21

Combine like terms: 15 + 21 = 36
15 + -5x = 36

Solving
15 + -5x = 36

Solving for variable 'x'.

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

Add '-15' to each side of the equation.
15 + -15 + -5x = 36 + -15

Combine like terms: 15 + -15 = 0
0 + -5x = 36 + -15
-5x = 36 + -15

Combine like terms: 36 + -15 = 21
-5x = 21

Divide each side by '-5'.
x = -4.2

Simplifying
x = -4.2

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