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OpenStudy (anonymous):
solve -20≤4x-7≤-2
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OpenStudy (anonymous):
add 7 on both sides \[-20+7\le4x\le-2+7\] \[-13\le4x\le5\] \[(-13/4)\le x \le(5/4)\]
OpenStudy (hoblos):
\[-13/4\le x \le 5/4\]
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