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4x - y = 7 (samakan koefisien y)
2x + 3y = 21
12x - 3y = 21 +
14x = 42
x = 3
nilai y ⇒2x + 3y = 21
6 + 3y = 21
3y = 21 -6
y = 5
x+y = 3+5
= 8