Answer: 18
Step-by-step explanation: You would substitute x for 3 in the expression. This would equal 21-3, or 18 when simplified
=> 4(7)–2(7+a)=8
<h3>=>28–14
<em>–</em>2a=8</h3><h3>=>14–2a=8</h3><h3>=>-2a=8–14</h3><h3>=>
<em>-</em>2a=-6</h3><h3>
<em>=>a=3</em></h3>
Answer: I think its 2.29
Step-by-step explanation:
Answer:

Step-by-step explanation:
