Solve.
a + b = 21
a = 20
b = 15
a = 373
b =-161
a = 12
b = 9
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04:14

With a= 20 and b= 15

a+b= 20 + 15 = 35

With a = 373 and b= -161

a+b= 373 + (-161) = 373 - 161 = 121

With a = 12 and b = 9

a+b= 12 + 9 = 21

Step-by-step explanation:

x = -4

step-by-step explanation:

- 20 - 4(x + 3) = 4x

=> -20 - 4x - 12 = 4x

=> - 32 -4x = 4x

=> -32 = 4x + 4x

=> - 32 = 8x

=> -32/8 = x

=> -4 = x