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Answer:
x = 1
Explanation:
from the diagram
RT = RS + ST , that is
13x + 1 = 5 + 10x - 1
13x + 1 = 10x + 4 ( subtract 10x from both sides )
3x + 1 = 4 ( subtract 1 from both sides )
3x = 3 ( divide both sides by 3 )