Question

y + 4 = - 15
3 x +9 = 12
10 - 4 x = 9 + 2 x
a - 3 a + 5 a = 12

Answer 1

y=-15-4

y=-19

3x=12-9

3x=3

x=3÷3

x=1

-4x-2x=9-10

-6x=-1

x=-1÷-6(-1)

x=1/6

a-3a+5a=12

3a=12

a=12÷3

a=4