A = 7 × x + 7 × 3
A = 7x + 21
B = 4 × z + 4 × 2
B = 4z + 8
C = 3 × 8 + 3 × y
C = 24 + 3y
D = t × 6 + t × t
D = 6t + t²
E = 5 × 3 + 5 × 2x
E = 15 + 10x
F = 2 × 7y + 2 × 9
F = 14y + 18
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A = 7 × x + 7 × 3
A = 7x + 21
B = 4 × z + 4 × 2
B = 4z + 8
C = 3 × 8 + 3 × y
C = 24 + 3y
D = t × 6 + t × t
D = 6t + t²
E = 5 × 3 + 5 × 2x
E = 15 + 10x
F = 2 × 7y + 2 × 9
F = 14y + 18