solve the equation.\n2x - 3 + 4x = 21\nx = -12\nx = -6\nx = 4\nx = 6

Explanation:

Step1: Combine like - terms

$2x+4x - 3=21$ $6x - 3=21$

Step2: Add 3 to both sides

$6x-3 + 3=21 + 3$ $6x=24$

Step3: Divide both sides by 6

$\frac{6x}{6}=\frac{24}{6}$ $x = 4$

Answer:

C. $x = 4$