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x+3y=-21
x+3(2x)=-21
x+6x=-21
7x=-21
x=-3
y=2x
y=2(-3)
y=-6
Semoga bermanfaat
X + 3Y = -21
3Y = 3 X 2x = 6x
= x + (3 x 2x) = -21
= x + 6x = -21
= 7x = -21
= x = -21 : 7 (-21/7)
= x = -3
hasilnya x = -3
y = 2x
y = 2 x -3
y = -6
hasilnya y = -6
hasil seluruhnya x = -3 dan y = -6