Question 95124
SUGGESTION: GO TO THE LIBRARY & GET A TEXT BOOK
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3(5X-2=54
15X-6=54
15X=54+6
15X=60
X=60/15
X=4 ANSWER.
PROOF
3(5*4-2)=54
3(20-2)=54
3(18)=54
54=54
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-5+X=-21
X=-21+5
X=-16 ANSWER.
PROOF
-5-16=-21
-21=-21
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7-4X>3-3X
-4X+3X>3-7
-X>-4
X<4 (WHEN DIVIDING BY A NEGATIVE NUMBER (HERE IT IS -1) WE REVERSE THE > SIGN TO A < SIGN).
PROOF
LET X BE EQUAL TO 3
7-4*3>3-3*3
7-12>3-9
-5>-6 WHICH IS TRUE.