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1) 12x²a² × 4xa³
= 12 ×4 (x)²+¹ × (a)²+³
= 48x³a⁵
2) y + 7 = 3
y = 3 - 7
y = -4
3) a - 3.7 = -5
a = -5 + 3.7
a = - 1.3
4) 3x² ÷ x²
3x²
x²
= 3 × x²-²
= 3x⁰ (x⁰ = 1)
= 3
5) y/4 = -2
y = -2 × 4
y = -8
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