Question

3(x + 1) = 5(x - 2) + 7 x=?

Answer 1

Those are called binomials & you have to use the distributive property.
first: 3(x+1) distributed & simplified 3x+3 & 5(x-2) distributed & simplified is 5x-10, therefore 3(x+1) = 3x+3 & 5(x-2) = 5x-10. always simplify before solving any algebraic problem! 
second: so now we can say... 3x + 3 = 5x - 10 + 7 .
third: now we combine like terms by adding the -10 & 7 (on the right side) together to get -3.
fourth: now we have to isolate the variables by doing the opposite function on each side! it should look like this right now: 3x + 3 = 5x - 3 ... subtract the 3x, on both sides, from the 5x to get 2x. looks like this now: 3 = 2x - 3
now add the -3 (on the right) on the both sides
looks like this now: 6 = 2x
fifth: now divide to get 3.     X = 3 !!!!!

Answer 2

1.4 repeating? 


3x+3=5x-10+7x
3x+3=12x-10
3=9x-10
13=9x
1.4 repeating=x