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primero resolvemos
7(x-2+3-8x+24) = -2
↓ ↓ ↓↓↓↓↓↓↓↓
7x-14+21-56x+168 = -2
ahora sacamos a x
↓↓↓↓↓↓↓↓↓↓↓↓↓
-49x+175 = -2
↓↓↓↓↓↓↓↓↓↓↓↓↓↓
-49x = -177
↓↓↓↓↓↓↓↓↓
x = -177 / -49
x = 177/49
espero te sirva
saludos