1. Section 6.5
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In a system of equations, if the left-hand sides of both equations are equal, the right-hand sides also are equal.
(a,b) = (-3, - 1/2)
LHS+2b=RHS+2b
LHS-3=RHS-3
.LHS /14.=.RHS /14.
b= -1/2
Put minus sign in denominator
-2 * a/-2= a
Subtract term