symbols - how to solve two equal symbolic equations in matlab -

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i define symbol that

va = sym('va'); vb = sym('vb');

after calculations, get

vb = somenumbers*va + someother numbers;

then , got result's backup , keep vbbackup

and again after calculations vb becomes different number respect va , 2 equations shown

actually meant ;

vb = 6*va + 3; vbbackup = 8*va + 2;

how can value of va ?


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