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Equations Lesson 4
供稿人: Schuller Glase
4(a + 2) + 6 = 20
4a +
+ 8 + 6 = 20
-14   -14
a = 1.5
= 20
= 6
4
3(b + 5) - 5b = 40
-2b + 15 = 40
+
- 5b = 40
-2b = 25
b = -12.5
-2
-4(2d - 5) - 3 = 50
-8d +
-8d + 17 = 50
-8d = 33
-3 = 50
d = -4.125
- 17
-8
-8(-2d - 6) - 2d = 50
(hint - like terms on same side!)
+ 48 - 2d = 50
+ 48 = 50
-48    -48
14     14
d = 1/7
=
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