Question

RESOLVA AS EQUAÇOES ;

3,5X + 8 = 2 (X + 7 ) ??

6(3X +2 ) - 8 = -2 ??

-3 (X - 5 ) - 2 (2X + 1) = -8 ???

Answer 1

equação 1.

3,5x+8 = 2(x+7)
3,5x+8 = 2x+14
3,5x-2x = 14-8
1,5x = 6
x = 6/1,5

x = 4

equação 2.

6(3x+2)-8 = -2
18x+12-8 = -2
18x = -2-12+8
18x = -6
x = -6/18

x = -1/3

equação 3.

-3(x-5)-2(2x+1) = -8
-3x+15-4x-2 = -8
-3x-4x = -8-15+2
-7x = -21
7x = 21
x = 21/7

x = 3