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2 (2x + 5) = 38
4x +10 = 38
4x = 38-10
4x = 28
x = 28/4
x = 7
model matematikanya bergaris tebal
panjang = x + 5
keliling = 2(p+l)
2( x + x+ 5 ) = 38
2 (2x + 5) = 38
4x + 10 = 38
hanya model matematikanya saja kan?