Question

T + 3t - 7 = 4t - 7???

Answer 1

$t+ 3t - 7 = 4t - 7\\ -7=-7\\ x\in\mathbb{R}$

Answer 2

$t+3t-7=4t-7\\\\4t-7=4t-7\ \ \ \ \ |subtract\ 4t\ from\ both\ sides\\\\-7=-7-TRUE\\\\infinitely\ many\ solutions;\\each\ number\ is\ a\ root\ of\ the\ equation\\\\t\in\mathbb{R}$