Example

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

Question

$$x+x+x=12; x+x+y=16; 4\times a=40; a\times b=?$$

Solve for x, y, z

$z=10b$

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