If (2x-1). (5x-6). (6x + 2) and (15r-9) are in proportion, find the value of x
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(2x-1)×(15x-9)=(5x-6)×(6x+2)
30x-18x-15x+9=30x+10x -36x-12
-3x+9=4x-12
4x-3x=12+9
x=21
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