SOLUTION: In 10 ​years, a​ child's age will be 4 years less than triple her current age. Find the​ child's current age I know what x is but as far as how to write it i can

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Question 1023779: In 10 ​years, a​ child's age will be 4 years less than triple her current age. Find the​ child's current age I know what x is but as far as how to write it i cant figure it out .
Found 2 solutions by Fombitz, Cromlix:
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
A%2BB%2BC=180
C=180-30-45
C=105
So then use the law of sines,
sin%28A%29%2Fa=sin%28B%29%2Fb
sin%2830%29%2F20=sin%2845%29%2Fb
b=20%2A%28sin%2845%29%2Fsin%2830%29%29
b=20sqrt%282%29
b=28.284
and,
sin%28A%29%2Fa=sin%28C%29%2Fc
c=20%2A%28sin%28105%29%2Fsin%2830%29%29
c=20%2A1.93185
c=38.637

Answer by Cromlix(4381) About Me  (Show Source):
You can put this solution on YOUR website!
Hi there,
Make the child's age = 'x'
In 10 ​years, a​ child's age will be 4
years less than triple her current age.
x + 10 = 3x - 4
Collect like terms
x - 3x = - 4 - 10
-2x = - 14
x = 7
Child's current age is 7 yrs old.
Hope this helps :-)