7:3a The house was roofed with cedar above the beams that rested on the pillars—

The roof over the beams/boards that the columns supported was made of cedar wood.
-or-
Solomon ⌊also had his workmen⌋ build a pine roof. The planks/rafters resting on the pillars supported the roof.

7:3b forty-five beams, fifteen per row.

There were ⌊a total of⌋ 45 beams/boards, and there were 15 beams/boards in each row.
-or-
They used forty-five (45) planks/rafters. There were fifteen (15) rafters to each ⌊of three⌋ rows.

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