solution:
16. Solve the equation below.
\[
12+x=-3(4-x)
\]
17. Complete the equation so it solution of $x=2$.
\[
20 x-16=4 x+
\]
18. Complete the equation so it many solutions.
\[
0.3(6 x-5)=-1.5+
\]

Answer

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Answer

$\text{The equation has many solutions when it is an identity.}$

Steps

Step 1 ：$12 + x = -3(4 - x)$

Step 2 ：$12 + x = -12 + 3x$

Step 3 ：$2x = 24$

Step 4 ：$\boxed{x = 12}$

Step 5 ：$20x - 16 = 4x + 4$

Step 6 ：$16x = 20$

Step 7 ：$\boxed{x = \frac{5}{4}}$

Step 8 ：$0.3(6x - 5) = -1.5 + 0.3(6x - 5)$

Step 9 ：$\text{The equation has many solutions when it is an identity.}$