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Volume of a brick = 0.00975 m³.

Step-by-step explanation:

Volume of the wall = 63 m³

Cost to build the wall = 84000 Rs

Cost to prepare a brick = 13 Rs

Since, relation between cost of the wall is directly proportional to the volume of the wall

C ∝ V

C = kV

Here, k = Proportionality constant

k = = Constant

Therefore,

V₂ =

    = 0.00975 m³

Therefore, volume of a brick is 0.00975 m³.

-2x + 7 = 7

subtract 7 from both sides.

-2x = 0

divide both sides by -2.

x = 0