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If you mean: 7+2b = 1 then the value of b is -3
That depends what either the value of a or the value of b is.
a( 10 ) - b( 5 ) = 5 ?
15
you can't get a value for either a or b from just the information you have given - you can only get an expression for what a is in terms of b and vice versa; a=3+b b=a-3