Question 366514
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Hi, 
*Note:  As we know, there is no 'magic' in the discipline of mathematics :)
which means, there are no surprises either!

{{{(-7/2)(-2/7)x = (-7/2)(6/35)= -42/70 }}}
x = -42/70
Great job! getting this far. 
simplifying further
x = -42/70 
dividing both numerator and denominator by 2
x = -21/35