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{{ printedBook.courseTrack.name }} {{ printedBook.name }} a

$-21 +a=85 $

AddEqn$LHS+21 =RHS+21 $

$a=85 +21 $

ExpandFrac$ba =b⋅4a⋅4 $

$a=85 +84 $

AddFracAdd fractions

$a=89 $

b

$w=43 −52 $

ExpandFrac$ba =b⋅5a⋅5 $

$w=4⋅53⋅5 −52 $

ExpandFrac$ba =b⋅4a⋅4 $

$w=4⋅53⋅5 −5⋅42⋅4 $

MultiplyMultiply

$w=2015 −208 $

SubFracSubtract fractions

$w=207 $

c

$-5k =107 $

MultEqn$LHS⋅5=RHS⋅5$

$-k=107 ⋅5$

MoveRightFacToNum$ca ⋅b=ca⋅b $

$-k=1035 $

ChangeSignsChange signs

$k=-1035 $

ReduceFrac$ba =b/5a/5 $

$k=-27 $