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Answer is in the image.
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Answer:
(a) 2/7-(-3/7)+(-3/5)+11/10
= 2/7+3/7-3/5+11/10
= 5/7-6/10+11/10
= 5/7+5/10
= 50/70+35/70
= 85/70
= 17/14
(b) 3/4-(-19/12)
= 3/4+19/12
= 9/12+19/12
= 28/12
= 7/3
(c) -2/5 -4/7
= -14/35-20/35
= -34/35
(d) 6x+5 = -3x-7
or, 6x+3x = -7-5
or, 9x = -12
or, x = -12/9
or, x = -4/3
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