Question

find the value of x+x+7x-1=0

Answer 1

$9x = 1 \\ x = \frac{1}{9}$
this question can be done by collecting like terms and shifting - 1 to to the right hand side of equal to sign

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Answer 2

x+x+7x-1=0
9x-1=0
9x=1
x=1/9

I hope this will help u.............