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x+3x-6=2x+10
4x-2x=10+6
2x=16
x=16/2
x=8
b)3^2x=81·9⁴
3^2x=3⁴·(3²)⁴
3^2x=3⁴⁺⁸
3^2x=3¹²
2x=12
x=12/2
x=6