SAT Mathematics Practice Test 2

When 4 times the number x is added to $12$, the result is $12+4\mathit{x}.$ Since this result is equal to 8, the equation 12 + 4x = 8 must be true.Subtracting 12 from each side of $12+4\mathit{x}=8$ gives $4\mathit{x}=-4$, and then dividing both sides of $4\mathit{x}=-4$ by 4 gives $\mathit{x}=-1$. Therefore, 2 times $\mathit{x}$ added to 7, or $7+2\mathit{x}$, is equal to $7+2\left(-1\right)=5$.
Choice A is incorrect because −1 is the value of x, not the value of $7+2\mathit{x}$.Choices C and D are incorrect and may result from calculation errors.