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b

$2s−2t−40=0$

DivEqn$LHS/2=RHS/2$

$s−t−20=0$

AddEqn$LHS+t=RHS+t$

$s−20=t$

RearrangeEqnRearrange equation

$t=s−20$

c

d

$a=7b−21$

AddEqn$LHS+21=RHS+21$

$a+21=7b$

DivEqn$LHS/7=RHS/7$

$7a+21 =b$

RearrangeEqnRearrange equation

$b=7a+21 $