s*4-40=12

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Solution for s*4-40=12 equation: 



s*4-40=12

We move all terms to the left:

s*4-40-(12)=0

We add all the numbers together, and all the variables

s*4-52=0

Wy multiply elements

4s-52=0

We move all terms containing s to the left, all other terms to the right

4s=52

s=52/4

s=13

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