$4 + 3 \cdot \frac{i}{3} - 4 i = - 3 i + 4$

Explanation

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$4 + 3 \cdot \frac{i}{3} - 4 i \overset{◯}{1} 4 + i - 4 i \overset{◯}{2} - 3 i + 4$
①	Multiply $3$ by $\frac{i}{3}$ to get $i$ . Step 1: Write $3$ as a fraction by putting $1$ in the denominator. Step 2: Cancel $3$ in first and second fraction. Step 3: Multiply numerators and denominators. Step 4: Simplify numerator and denominator. $3 \cdot \frac{i}{3} Step 1 \frac{3}{1} \cdot \frac{i}{3} Step 2 \frac{1}{1} \cdot \frac{i}{1} = Step 3 \frac{1 \cdot i}{1 \cdot 1} Step 4 \frac{i}{1} = i$
②	Combine like terms: $4 + i - 4 i = - 3 i + 4$

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4+3⋅3i​−4i=−3i+4

$4 + 3 \cdot \frac{i}{3} - 4 i = - 3 i + 4$