Answer: x=1
Step-by-step explanation: Rearrange the equation by subtracting what is to the right of the equal sign from both sides of the equation :
3*x+2*(5*x-3)-(7)=0
3x + 2 • (5x - 3)) - 7 = 0
Pull out like factors :
13x - 13 = 13 • (x - 1)
13 = 0
A a non-zero constant never equals zero.
Solve : x-1 = 0
Add 1 to both sides of the equation :
x = 1
Suppose that Carol has x 10p coins in her purse. Since she has three times as many 20p coins as 10p coins, then she has 3x 20p coins in her purse.
x coins of 10p value $0.10x and 3x coins of 20p value $0.60x.
In total this amount of money is $(0.10x+0.60x)=$0.70x that is exactly $4.20. Thus, you get the equation
0.70x=4.20.
Solve it:

Carol has 6 coins of 10p and 3·6=18 coins of 20p.
X2 = 50
Divide both sides by 2
X2/2 = 50/2
X = 25
45 mph down highways 32 in citys
Answer:
2.25 hours
Step-by-step explanation:
Given data
distance= 36 km
speed= 16 km/h
Speed= distance/time
substitute
16= 36/t
t= 36/16
t= 2.25 hours