Example

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

Question

$$a=\frac{-1}{2},b.3\frac{-2}{5},\frac{11}{5}; (a+b)+c=a+(b+c)$$

Solve for a, c, b

$c=-\frac{3b}{25}$

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