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(x+2)/3 = (2x+1)/2 (kalikan silang)
2(x+2) = 3(2x+1)
2x+4 = 6x+3
2x - 6x = 3 - 4
-4x = -1
x = -1/-4
x = 1/4
2) 4z/2 - 5/2 = z + 21/4
4z/2 - 5/2 = 4z/4 + 21/4
(4z-5)/2 = (4z+21)/4 (kalikan silang)
4(4z-5) = 2(4z+21)
16z - 20 = 8z + 42
16z - 8z = 42 + 20
8z = 62
z = 62/8
z = 31/4
z = 7 ¾
semoga dapat di pahami