Question

$5x - 7 \geqslant - 4x + 11$
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Answer 1

$\it 5x-7\geq-4x+11\ \Rightarrow\ 5x+4x\geq11+7\ \Rightarrow\ 9x\geq18|_{:9}\ \Rightarrow\ x\geq2\ \Rightarrow\ \\ \\ \ \Rightarrow\ x\in[2,\ \ \infty)$

Answer 2

5x+4x>_ 7+ 11
9x>_ 18
x>_2
X aparține {2,3,4...}