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T - 10 = 4a - 40
T = 4a - 40 + 10
T = 4a - 30
.
.
T = 2a
.
.
4a - 30 = 2a
4a - 2a = 30
2a = 30
a = 15
.
.
T + 10
2a + 10
2(15) + 10
30 + 10
40