4m + Зn = 18, Зm - 2n = 5 solve simultaneous equations
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4m+3n=18----eqn1
3m-2n=5------eqn2
multiply first eqn1 by 2 and eqn2 by 3
8m+6n=36
9m-6n=15
subtract above 2 eqn
17m=51
m=3
substitute in eqn1
12+3n=18
3n=6
n=2
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