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2x-y=-7
4(x+1)+2y=18
y=7+2x
4x+4+2(7+2x)=18
4x+4+14+4x=18
8x+18=18
x=0
b)
2-4x=3x^2
3x²+4x-2=0
Δ= 4²-4*-2*3
Δ=16+24
Δ=40
√Δ=√40
√Δ=2√10
x₁=(4-2√10)/6
x₁=(2-√10)/3
x₂=(4+2√10)/6
x₂=(2+√10)/3
x₁=(2-√10)/3 ∨ x₂=(2+√10)/3
c)
2(2-3x)<5x
4-6x<5x
4<11x
x>4/11