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Pre-Algebra Examples
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Pre-Algebra
Add (9x-5y)+(3x+2y-7)
(
9
x
-
5
y
)
+
(
3
x
+
2
y
-
7
)
(
9
x
−
5
y
)
+
(
3
x
+
2
y
−
7
)
Step 1
Remove parentheses.
9
x
-
5
y
+
3
x
+
2
y
-
7
9
x
−
5
y
+
3
x
+
2
y
−
7
Step 2
Add
9
x
9
x
and
3
x
3
x
.
12
x
-
5
y
+
2
y
-
7
12
x
−
5
y
+
2
y
−
7
Step 3
Add
-
5
y
−
5
y
and
2
y
2
y
.
12
x
-
3
y
-
7
12
x
−
3
y
−
7
[
x
2
1
2
√
π
∫
x
d
x
]
⎡
⎢
⎣
x
2
1
2
√
π
∫
x
d
x
⎤
⎥
⎦
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