Answer:
(i) \[3x-5-x+9=3x-x+9-5\] \[\left| \text{rearranging terms} \right.\] \[=2x+4=2(3)+4\] \[=6+4=10\] (ii) \[2-8x+4x+4=4x-8x+2+4\] \[\left| \text{rearranging terms} \right.\] \[=-4x+6=-4(3)+6\] \[=-12+6=-6\]. (iii) \[3a+5-8a+1=3a-8a+5+1\] \[\left| \text{rearranging terms} \right.\] \[=-5a+6=-5(-1)+6\] \[=5+6=11\]. (iv) \[10-3b-4-5b=-3b-5b+10-4\] \[\left| \text{rearranging terms} \right.\] \[=-8b+6=-8(-2)+6\] \[=16+6=22.\] (v) \[2a-2b-4-5+a=2a+a-2b-4-5\] \[\left| \text{rearranging terms} \right.\] \[=3a-2b-9\] \[=3(-1)-2(-2)-9\] \[=-3+4-9=4-3-9\] \[=4-12=-8\]
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