2z+17=21 subtract 17 from both sides. 2z=4 divide both sides by 2 z=2
2z - 5 = 11 Add 5 to both sides: 2z = 16 Divide both sides by 2: z = 8
9z + 10 - 6z = 7 + 2z - 3 gather together z terms on the left 3z + 10 = 7 + 2z - 3 gather integers on the right 3z + 10 = 2z + 4 subtract 2z from each side z + 10 = 4 subtract 10 from each side z = - 6 ----------------check in original equation 9(- 6) + 10 - 6(- 6) = 7 + 2(- 6) - 3 - 54 + 10 + 36 = 7 - 12 - 3 - 8 = - 8 --------------checks
60j + 2z = 6
y and ½z
8
2z+17=21 subtract 17 from both sides. 2z=4 divide both sides by 2 z=2
z = 18.5 6z - 24 = 2z + 50 Take the -24 to the other side of the equals and change its sign; take the 2z to the other side of the equals and change its sign: => 6z - 2z = 50 + 24 => 4z = 74 Divide both sides by 4: => z = 18.5
(-3) x (-2z - 7) = 6z + 21 = 3 (2z + 7)
2z+9.75-7z=-5.15
2z - 5 = 11 Add 5 to both sides: 2z = 16 Divide both sides by 2: z = 8
9z + 10 - 6z = 7 + 2z - 3 gather together z terms on the left 3z + 10 = 7 + 2z - 3 gather integers on the right 3z + 10 = 2z + 4 subtract 2z from each side z + 10 = 4 subtract 10 from each side z = - 6 ----------------check in original equation 9(- 6) + 10 - 6(- 6) = 7 + 2(- 6) - 3 - 54 + 10 + 36 = 7 - 12 - 3 - 8 = - 8 --------------checks
16(2z-3)
60j + 2z = 6
3x 3y + 6z = 12
y and ½z
13y+3z+8