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A,B are two points on a given line L.L is the midpoint of the section AB. find the coordinate of point B if the coordinate of A=7 and the coordinate of L=4

2 answers

B--------L--------A
|---3----|----3----|

7-4= 3

4-3 = 1

so, B = 1
A(7,0), L(4,0)), B(x,0).

x-7 = 2(4-7).
X = 1.
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