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2x + 4 = 3x -8
-x = -12
x = 12
y + 5 =2y -7
-y = -12
y = 12
A)nilai x dan y masing" adalah 12 dan 12
B)panjang = 2x + 4
= 2(12) + 4
=28 m
lebar = y + 5
=12 + 5
=17 m