Arthur D. answered • 01/21/17
Tutor
4.9
(306)
Forty Year Educator: Classroom, Summer School, Substitute, Tutor
1/7x+8=-6/7x-7
multiply both sides by 7x
1+56x=-6-49x
56x+49x=-6-1
105x=-7
divide both sides by 105
x=-7/105
x=-1/15
Kenneth S.
Once again, we see the need for parentheses to make the order of computations clear (to both students and tutors).
PEMDAS says: one divided by 7, and then that result is MULTIPLIED by x. In other words, the fraction 1/7 is the coefficient of x.
This type of mistake is the most frequent one in the math presented on this non-blackboard platform.
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01/21/17
Andrew M.
01/21/17