Let's say I am a node and I am connected to 7 other nodes.
4 of those nodes transmit me a tx or a block and say it's valid.
(I am aware they do not explicitly send a message saying that something they sent is valid or not they would not send it in the first place.)
So will my node accept the block/tx as most of the nodes I am connected to agree that this "x" tx or block is valid?