Question 484319

1.

{{{a+(a-3)=(a+2)-(a+1)}}}

{{{a+a-3=a+2-a-1}}}

{{{2a-3=cross(a)+1-cross(a)}}}

{{{2a-3=1}}}

{{{2a=1+3}}}

{{{2a=4}}}

{{{a=4/2}}}

{{{highlight(a=2)}}}

2.

{{{0.8-4(b-1)=0.2+3(4-b)}}}

{{{0.8-4b+4=0.2+12-3b}}}

{{{0.8-0.2-12+4=4b-3b}}}

{{{0.6-8=b}}}

{{{highlight(-7.4=b)}}}