SOLUTION: Hello, i have to solve these equations by rearranging. 1.3x=7 2.12(x+5)=3(7+4x) 3.5(x-3)=2x-3(x+1) Thank you for all your help :) much appreciated

Question 441095: Hello, i have to solve these equations by rearranging.
1.3x=7
2.12(x+5)=3(7+4x)
3.5(x-3)=2x-3(x+1)
Thank you for all your help :)
much appreciated
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
1.3x=7
divide both sides by 3
x =
:
2.12(x+5)=3(7+4x)
multiply whats inside the brackets
12x + 60 = 21 + 12x
Combine like terms
12x - 12x = 21 - 60
0 = -39, obviously not a valid equation
:
3. 5(x-3)=2x-3(x+1)
5x - 15 = 2x - 3x - 3; neg outside the brackets, changes the sign inside
5x - 15 = -x - 3
5x + x = -3 + 15
6x = 12
divide both sides by 6
x =
x = 2
Check solution in original equation
5(2-3)=2(2)-3(2+1)
5(-1) = 4 -3(3)
-5 = 4 -9
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