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3(x-1)+4(x+2)=26
3x-3+4x+8=26
7x=26-8+3
7x=21
x=21/7
x=3
la respuesta es 3
saludos
3(x-1) + 4(x+2) = 26
3x-3 + 4x+8 = 26
7x + 5 = 26
7x = 26-5
7x = 21
x = 21/7
x = 3