-2(3rc+6)-(4rc-3)=21

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Solution for -2(3rc+6)-(4rc-3)=21 equation:


Simplifying
-2(3rc + 6) + -1(4rc + -3) = 21

Reorder the terms:
-2(6 + 3cr) + -1(4rc + -3) = 21
(6 * -2 + 3cr * -2) + -1(4rc + -3) = 21
(-12 + -6cr) + -1(4rc + -3) = 21

Reorder the terms:
-12 + -6cr + -1(-3 + 4cr) = 21
-12 + -6cr + (-3 * -1 + 4cr * -1) = 21
-12 + -6cr + (3 + -4cr) = 21

Reorder the terms:
-12 + 3 + -6cr + -4cr = 21

Combine like terms: -12 + 3 = -9
-9 + -6cr + -4cr = 21

Combine like terms: -6cr + -4cr = -10cr
-9 + -10cr = 21

Solving
-9 + -10cr = 21

Solving for variable 'c'.

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

Add '9' to each side of the equation.
-9 + 9 + -10cr = 21 + 9

Combine like terms: -9 + 9 = 0
0 + -10cr = 21 + 9
-10cr = 21 + 9

Combine like terms: 21 + 9 = 30
-10cr = 30

Divide each side by '-10r'.
c = -3r-1

Simplifying
c = -3r-1

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