Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$10\cdot=S+(1d-1)\times3$$

Answer

S=-30*(d-1)

Solution


Simplify  \(1\times d\)  to  \(d\).
\[10=S+(d-1)\times 3\]
Regroup terms.
\[10=S+3(d-1)\]
Subtract \(3(d-1)\) from both sides.
\[10\times -3(d-1)=S\]
Simplify  \(10\times -3(d-1)\)  to  \(-30(d-1)\).
\[-30(d-1)=S\]
Switch sides.
\[S=-30(d-1)\]
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