Question

Determina nr.necunoscut din egalitatile:
2×a+16=86
X-17×2=21
15×a÷9=5

Answer 1

2a+16=86
2a=86-16
a=70:2
a=35

x-34=21
x=21+34
x=55

15a:9=5
15a=9x5
a=45:15
a=3

Answer 2

[tex]2a+16=86|-16 \\ 2a=70|:2 \\ \boxed{a=35} \\ \\ x-17*2=21 \\ x-34=21|+34 \\ \boxed{x=55} \\ \\ 15a:9=5|*9 \\ 15a=45|:15 \\ \boxed{a=3}[/tex]