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5x+y =7 |x2
__________
3x - 2y =12
10x+2y=14
__________ +
13x = 26
x = 2
substitusi nilai x
5x+y=7
5(2)+y=7
y=-3
p=x=2
q=y=-3
4p+3q = 4(2) + 3(-3) = -1