40(13+k)=1040

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Solution for 40(13+k)=1040 equation: 



40(13+k)=1040

We move all terms to the left:

40(13+k)-(1040)=0

We add all the numbers together, and all the variables

40(k+13)-1040=0

We multiply parentheses

40k+520-1040=0

We add all the numbers together, and all the variables

40k-520=0

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

40k=520

k=520/40

k=13

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