A stick is cut into three pieces of lengths (7x-2y+3z) cm, (y-3x+7z) CM and (z-36+x) cm. Find the original length of the stick.
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Answer: the original length of stick = the sum of pieces of stick
=(7x-2y+3z) + (y-3x+7z) + (z-36+X)
{Open the brackets and then solve}
=7x-2y+3z+y-3x+7z+z-36+X
{ Now solve the terms with same variables}
=7x-3x+x-2y+y+3z+7z+z-36
=5x-y+11z-36
Therefore, (5x-y+11z-36)cm is the original length of the stick.
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