RCC Structures Design
According to the steel beam theory of doubly reinforced beams

Stress in tension steel equals the stress in compression steel
Compression is resisted by compression steel
All of the listed here
Tension is resisted by tension steel

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RCC Structures Design
If the length of a combined footing for two columns l meters apart is L and the projection on the left side of the exterior column is x, then the projection y on the right side of the exterior column, in order to have a uniformly distributed load, is (where x̅ is the distance of centre of gravity of column loads).

y = L/2 - (l + x̅)
y = L/2 + (l - x̅)
y = L/2 - (l - x̅)
y = L - (l - x̅)

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