-3(x-5)-7x=-21

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


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

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

Combine like terms: -3x + -7x = -10x
15 + -10x = -21

Solving
15 + -10x = -21

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 + -10x = -21 + -15

Combine like terms: 15 + -15 = 0
0 + -10x = -21 + -15
-10x = -21 + -15

Combine like terms: -21 + -15 = -36
-10x = -36

Divide each side by '-10'.
x = 3.6

Simplifying
x = 3.6

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