-3(10-s+1)=-21

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Solution for -3(10-s+1)=-21 equation: 


Simplifying
-3(10 + -1s + 1) = -21

Reorder the terms:
-3(10 + 1 + -1s) = -21

Combine like terms: 10 + 1 = 11
-3(11 + -1s) = -21
(11 * -3 + -1s * -3) = -21
(-33 + 3s) = -21

Solving
-33 + 3s = -21

Solving for variable 's'.

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

Add '33' to each side of the equation.
-33 + 33 + 3s = -21 + 33

Combine like terms: -33 + 33 = 0
0 + 3s = -21 + 33
3s = -21 + 33

Combine like terms: -21 + 33 = 12
3s = 12

Divide each side by '3'.
s = 4

Simplifying
s = 4

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