4+3t = 22
3t = 22-4
t = (22-4)/3
t = 6
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-12t+4
Gather like terms: 3t - t = 13 - 4 ie 2t = 9 so t =4½ Check: 3t = 13½ + 4 = 17½, 4½ +13 = 17½ QED
if you mean T-3t+2t+4 (T and t is different variables):T-3t+2t+4=T-t+4if you mean t-3t+2t+4:t-3t+2t+4=4
4
I know where it comes from. National test questions page 156 of Collins new maths frame work year 8