12x^2 + 7x – 15 – 2x – x^2
11x^2 + 5x – 15
2x = 16
x=8
17 – x = 5x – 25
x=7
5(2 – 3) + 9
4
5x + 4 – 12x +3
-7x + 7
14 – 17
-3
93 – (-5 • 11)
148
3x – 2 = 31
x=11
0.4 • 95
38
3(4x – 9) + x
13x – 27
89.88 – 41.8
48.08
3x – 9 + 2y – x – 4 + 6y
2x + 8y – 13
7(x + 6) – 12
7x + 20
0.5 ÷ 0.125
4
-13 • 2 + (-8)
-34