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x + y = 25
x - y = 3 _
2y = 22
y = 11
x = 11 + 3 = 14
maka 2x + 2y = 2.14 + 2.11
= 28 + 22
= 50
atau cara cepat
2x + 2y = 2(x + y) ==> 2(25) = 50
semoga membantu
x-y=3
------- +
2x = 28
x = 14
y = 11
2x+2y=2.14+2.11= 28+22 =50