The problem:
(-3.4x + 4.7) - (3 + 2.9x)
First distribute the - over (3 + 2.9x)
-(3 + 2.9x) = -3 - 2.9x
Now we have:
(-3.4x + 4.7) - 3 - 2.9x
Now combine like terms:
(-3.4x + 4.7) - 3 - 2.9x
-3.4x + 4.7 - 3 - 2.9x
-6.3x + 4.7 - 3
-6.3x + 1.7
Answer = -6.3x + 1.7