which expressions are equivalent which expressions are equivalent to 2 4f+2g which expressions are equivalent to 2 b+3c which expressions are equivalent to 4d+6+2d which expressions are equivalent to 4 4a+5 which expressions are equivalent to 3x+3 x+y which expressions are equivalent to 4b which expressions are equivalent to z + z + 6 which expressions are equivalent to 3 4h+2k which expressions are equivalent to q+p+q+p+q which expressions are equivalent to k/2 which expressions are equivalent to -56z+28