Quattro equazioni per domani :o

[ValeSLB]

1-
3(5x + 2) -9x = 13 -{4x -[4-3 (7x +4) + 20x]-5} + 14x

2-
6x -[7-2 (2x + 6) + 8x] = 8x - {5- [6x -4(5-2x) +27 ] +25x}

3-
6- [5x - 2(2+6x) +13] = 8 - {3x-[2-3(3x+7) + 16x] - 6}

4-
(x+1)^2 + (x+4)^2 = (x-3)^^#2 + (x+6)^2


Grazie mille :hi

[Ot-Sofietta-Ot]

1-

-9 x+3 (2+5 x) = 22+30 x-3 (4+7 x)
-9 x+3 (2+5 x) = 22+30 x-3 (4+7 x)
-9 x+3 2+3 5 x = 22+30 x-3 4-3 7 x
-9 x+2 3+3 5 x = 22+30 x-3 4-3 7 x
-9 x+6+15 x = 22+30 x-12-21 x
= 6 x+6 = 9 x+10

2-

6 x-(7-2 (2 x+6)+8 x) = 8 x-(5-(6 x-4 (5-2 x)+27)+25 x)
6 x-(7-2 (2 x+6)+8 x) = 8 x-(5-(6 x+-(-4 (2 x-5))+27)+25 x)
6 x-(7-2 (2 x+6)+8 x) = 8 x-(5-(6 x+4 (2 x-5)+27)+25 x)
6 x-(7-2 (2 x+6)+8 x) = 8 x-(25 x-(8 x-20+6 x+27)+5)
6 x-(7-2 (2 x+6)+8 x) = 8 x-(25 x-(8 x+6 x-20+27)+5)
6 x-(7-2 (2 x+6)+8 x) = 8 x-(25 x-(8 x+6 x+7)+5)

3-

6-(5 x-2 (6 x+2)+13) = 8-(3 x-(2-3 (3 x+7)+16 x)-6)
6-(5 x-2 (6 x+2)+13) = -(3 x-(16 x+-21-9 x+2)-6)+8
6-(5 x-2 (6 x+2)+13) = -(3 x-(16 x-9 x-19)-6)+8
-5 x+2 (6 x+2)-7 = 13 x-3 (3 x+7)+16
x = -2/3

4-

(x+1)^2+(x+4)^2 = (x-3)^2+(x+6)^2
2 x^2+10 x+17 = (x-3)^2+(x+6)^2
2 x^2+10 x+17 = 2 x^2+6 x+45
4 x-28 = 0
4 (x-7) = 0
x-7 = 0
x = 7