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2a - a = -8 + 6
a = -2
b. 3(2x - 5) - (5x - 10) = 20
6x - 15 - 5x + 10 = 20
x - 5 = 20
x = 20 + 5
x = 25
2a. (2x + 4) = (4 + 3x)
2x - 3x = 4 - 4
-x = 0
x = 0
b. 3x + 5 = 6x + 2
3x - 6x = 2 - 5
-3x = -3
x = 1
semoga membantu ya :)